21023287131 has 32 divisors (see below), whose sum is σ = 35010759168. Its totient is φ = 10901514240.

The previous prime is 21023287127. The next prime is 21023287151. The reversal of 21023287131 is 13178232012.

It is not a de Polignac number, because 21023287131 - 2² = 21023287127 is a prime.

It is a super-2 number, since 2×21023287131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21023287151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46971 + ... + 210363.

It is an arithmetic number, because the mean of its divisors is an integer number (1094086224).

Almost surely, 2^21023287131 is an apocalyptic number.

21023287131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21023287131 is a deficient number, since it is larger than the sum of its proper divisors (13987472037).

21023287131 is a wasteful number, since it uses less digits than its factorization.

21023287131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163971.

The product of its (nonzero) digits is 4032, while the sum is 30.

The spelling of 21023287131 in words is "twenty-one billion, twenty-three million, two hundred eighty-seven thousand, one hundred thirty-one".