| Base | Representation |
|---|---|
| bin | 100111011000000… |
| … | …0001010110111000 |
| 3 | 10102002002111012121 |
| 4 | 1032300001112320 |
| 5 | 10201212230240 |
| 6 | 335034051024 |
| 7 | 44512053022 |
| oct | 11660012670 |
| 9 | 3362074177 |
| 10 | 1321211320 |
| 11 | 618875690 |
| 12 | 30a579a74 |
| 13 | 180953860 |
| 14 | c7683012 |
| 15 | 7aed004a |
| hex | 4ec015b8 |
1321211320 has 128 divisors (see below), whose sum is σ = 3605575680. Its totient is φ = 429120000.
The previous prime is 1321211317. The next prime is 1321211329. The reversal of 1321211320 is 231121231.
It is a super-2 number, since 2×13212113202 = 3491198704192284800, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 1321211294 and 1321211303.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1321211329) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173595 + ... + 181045.
It is an arithmetic number, because the mean of its divisors is an integer number (28168560).
Almost surely, 21321211320 is an apocalyptic number.
1321211320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1321211320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1802787840).
1321211320 is an abundant number, since it is smaller than the sum of its proper divisors (2284364360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1321211320 is a wasteful number, since it uses less digits than its factorization.
1321211320 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7517 (or 7513 counting only the distinct ones).
The product of its (nonzero) digits is 72, while the sum is 16.
The square root of 1321211320 is about 36348.4706693418. The cubic root of 1321211320 is about 1097.2967561747.
Adding to 1321211320 its reverse (231121231), we get a palindrome (1552332551).
The spelling of 1321211320 in words is "one billion, three hundred twenty-one million, two hundred eleven thousand, three hundred twenty".
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