12939307521 has 16 divisors (see below), whose sum is σ = 19721520000. Its totient is φ = 7392210048.

The previous prime is 12939307517. The next prime is 12939307559. The reversal of 12939307521 is 12570393921.

It is not a de Polignac number, because 12939307521 - 2² = 12939307517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12939307571) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27805 + ... + 163253.

It is an arithmetic number, because the mean of its divisors is an integer number (1232595000).

Almost surely, 2^12939307521 is an apocalyptic number.

It is an amenable number.

12939307521 is a deficient number, since it is larger than the sum of its proper divisors (6782212479).

12939307521 is a wasteful number, since it uses less digits than its factorization.

12939307521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140008.

The product of its (nonzero) digits is 102060, while the sum is 42.

The spelling of 12939307521 in words is "twelve billion, nine hundred thirty-nine million, three hundred seven thousand, five hundred twenty-one".