12821512 has 32 divisors (see below), whose sum is σ = 26363520. Its totient is φ = 5797440.

The previous prime is 12821503. The next prime is 12821521. The reversal of 12821512 is 21512821.

It is an interprime number because it is at equal distance from previous prime (12821503) and next prime (12821521).

It is a super-2 number, since 2×12821512² = 328782339932288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32098 + ... + 32494.

It is an arithmetic number, because the mean of its divisors is an integer number (823860).

Almost surely, 2^12821512 is an apocalyptic number.

It is an amenable number.

12821512 is an abundant number, since it is smaller than the sum of its proper divisors (13542008).

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

12821512 is a wasteful number, since it uses less digits than its factorization.

12821512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 777 counting only the distinct ones).

The product of its digits is 320, while the sum is 22.

The square root of 12821512 is about 3580.7138953008. The cubic root of 12821512 is about 234.0523904414.

The spelling of 12821512 in words is "twelve million, eight hundred twenty-one thousand, five hundred twelve".