21577151331 has 16 divisors (see below), whose sum is σ = 32709550720. Its totient is φ = 14050237320.

The previous prime is 21577151327. The next prime is 21577151359. The reversal of 21577151331 is 13315177512.

21577151331 is a `hidden beast` number, since 2 + 1 + 577 + 1 + 51 + 3 + 31 = 666.

It is not a de Polignac number, because 21577151331 - 2² = 21577151327 is a prime.

It is a super-2 number, since 2×21577151331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21577151831) 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, 9291325 + ... + 9293646.

It is an arithmetic number, because the mean of its divisors is an integer number (2044346920).

Almost surely, 2^21577151331 is an apocalyptic number.

21577151331 is a deficient number, since it is larger than the sum of its proper divisors (11132399389).

21577151331 is a wasteful number, since it uses less digits than its factorization.

21577151331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18585023 (or 18585017 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The spelling of 21577151331 in words is "twenty-one billion, five hundred seventy-seven million, one hundred fifty-one thousand, three hundred thirty-one".