12921712972 has 36 divisors (see below), whose sum is σ = 26560344720. Its totient is φ = 5484102624.

The previous prime is 12921712963. The next prime is 12921712997. The reversal of 12921712972 is 27921712921.

It is a super-2 number, since 2×12921712972² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299847 + ... + 340222.

Almost surely, 2^12921712972 is an apocalyptic number.

It is an amenable number.

12921712972 is an abundant number, since it is smaller than the sum of its proper divisors (13638631748).

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

12921712972 is a wasteful number, since it uses less digits than its factorization.

12921712972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640190 (or 640181 counting only the distinct ones).

The product of its digits is 63504, while the sum is 43.

The spelling of 12921712972 in words is "twelve billion, nine hundred twenty-one million, seven hundred twelve thousand, nine hundred seventy-two".