12921508 has 12 divisors (see below), whose sum is σ = 22983772. Its totient is φ = 6354720.

The previous prime is 12921449. The next prime is 12921527. The reversal of 12921508 is 80512921.

It can be written as a sum of positive squares in 2 ways, for example, as 262144 + 12659364 = 512^2 + 3558^2 .

It is a super-3 number, since 3×12921508³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26235 + ... + 26722.

Almost surely, 2^12921508 is an apocalyptic number.

It is an amenable number.

12921508 is a deficient number, since it is larger than the sum of its proper divisors (10062264).

12921508 is a wasteful number, since it uses less digits than its factorization.

12921508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53022 (or 53020 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 12921508 is about 3594.6499134130. The cubic root of 12921508 is about 234.6592798912.

The spelling of 12921508 in words is "twelve million, nine hundred twenty-one thousand, five hundred eight".