21131023323 has 16 divisors (see below), whose sum is σ = 28260260640. Its totient is φ = 14044605696.

The previous prime is 21131023279. The next prime is 21131023349. The reversal of 21131023323 is 32332013112.

It is not a de Polignac number, because 21131023323 - 2⁶ = 21131023259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21131023323.

It is not an unprimeable number, because it can be changed into a prime (21131023393) 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, 3304213 + ... + 3310601.

It is an arithmetic number, because the mean of its divisors is an integer number (1766266290).

Almost surely, 2^21131023323 is an apocalyptic number.

21131023323 is a deficient number, since it is larger than the sum of its proper divisors (7129237317).

21131023323 is a wasteful number, since it uses less digits than its factorization.

21131023323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9566.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21131023323 its reverse (32332013112), we get a palindrome (53463036435).

The spelling of 21131023323 in words is "twenty-one billion, one hundred thirty-one million, twenty-three thousand, three hundred twenty-three".