| Base | Representation |
|---|---|
| bin | 100100011001000… |
| … | …1011010110000100 |
| 3 | 10011002201222102120 |
| 4 | 1020302023112010 |
| 5 | 10000101110340 |
| 6 | 321100405540 |
| 7 | 42155201565 |
| oct | 11062132604 |
| 9 | 3132658376 |
| 10 | 1221113220 |
| 11 | 577317488 |
| 12 | 2a0b468b0 |
| 13 | 165ca7502 |
| 14 | b826816c |
| 15 | 7230b4d0 |
| hex | 48c8b584 |
1221113220 has 96 divisors (see below), whose sum is σ = 3521363328. Its totient is φ = 315942912.
The previous prime is 1221113203. The next prime is 1221113221. The reversal of 1221113220 is 223111221.
It is a super-2 number, since 2×12211132202 = 2982234992117536800, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 1221113220.
It is not an unprimeable number, because it can be changed into a prime (1221113221) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1249372 + ... + 1250348.
It is an arithmetic number, because the mean of its divisors is an integer number (36680868).
Almost surely, 21221113220 is an apocalyptic number.
1221113220 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 1221113220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1760681664).
1221113220 is an abundant number, since it is smaller than the sum of its proper divisors (2300250108).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221113220 is a wasteful number, since it uses less digits than its factorization.
1221113220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1589 (or 1587 counting only the distinct ones).
The product of its (nonzero) digits is 48, while the sum is 15.
The square root of 1221113220 is about 34944.4304575135. The cubic root of 1221113220 is about 1068.8546337145.
Adding to 1221113220 its reverse (223111221), we get a palindrome (1444224441).
The spelling of 1221113220 in words is "one billion, two hundred twenty-one million, one hundred thirteen thousand, two hundred twenty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.069 sec. • engine limits •