12921156 has 72 divisors (see below), whose sum is σ = 35459424. Its totient is φ = 3951360.

The previous prime is 12921137. The next prime is 12921163. The reversal of 12921156 is 65112921.

12921156 = 129² + 130² + ... + 344².

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26071 + ... + 26561.

It is an arithmetic number, because the mean of its divisors is an integer number (492492).

Almost surely, 2^12921156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12921156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17729712).

12921156 is an abundant number, since it is smaller than the sum of its proper divisors (22538268).

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

12921156 is a wasteful number, since it uses less digits than its factorization.

12921156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 556 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 12921156 is about 3594.6009514270. The cubic root of 12921156 is about 234.6571490559.

The spelling of 12921156 in words is "twelve million, nine hundred twenty-one thousand, one hundred fifty-six".