Search a number
-
+
1212222120 = 233537247157
BaseRepresentation
bin100100001000001…
…0000101010101000
310010111000021010120
41020100100222220
54440312101440
6320142043240
742016501164
oct11020205250
93114007116
101212222120
115722a446a
12299b79520
131641b35c5
14b6dd1ca4
1571651dd0
hex48410aa8

1212222120 has 192 divisors, whose sum is σ = 3841447680. Its totient is φ = 305869824.

The previous prime is 1212222091. The next prime is 1212222133. The reversal of 1212222120 is 212222121.

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 1212222120.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7721082 + ... + 7721238.

It is an arithmetic number, because the mean of its divisors is an integer number (20007540).

Almost surely, 21212222120 is an apocalyptic number.

1212222120 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 1212222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920723840).

1212222120 is an abundant number, since it is smaller than the sum of its proper divisors (2629225560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212222120 is a wasteful number, since it uses less digits than its factorization.

1212222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1212222120 is about 34816.9803400582. The cubic root of 1212222120 is about 1066.2541508167.

Adding to 1212222120 its reverse (212222121), we get a palindrome (1424444241).

Subtracting from 1212222120 its reverse (212222121), we obtain a palindrome (999999999).

The spelling of 1212222120 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty".