13057635721 has 16 divisors (see below), whose sum is σ = 14430539200. Its totient is φ = 11738986560.

The previous prime is 13057635719. The next prime is 13057635769. The reversal of 13057635721 is 12753675031.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13057635721 - 2¹ = 13057635719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13057635781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161626 + ... + 228556.

It is an arithmetic number, because the mean of its divisors is an integer number (901908700).

Almost surely, 2^13057635721 is an apocalyptic number.

It is an amenable number.

13057635721 is a deficient number, since it is larger than the sum of its proper divisors (1372903479).

13057635721 is a wasteful number, since it uses less digits than its factorization.

13057635721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67336.

The product of its (nonzero) digits is 132300, while the sum is 40.

The spelling of 13057635721 in words is "thirteen billion, fifty-seven million, six hundred thirty-five thousand, seven hundred twenty-one".