21023202321 has 32 divisors (see below), whose sum is σ = 34533920640. Its totient is φ = 12532449600.

The previous prime is 21023202307. The next prime is 21023202323. The reversal of 21023202321 is 12320232012.

21023202321 is a `hidden beast` number, since 21 + 0 + 2 + 320 + 2 + 321 = 666.

It is not a de Polignac number, because 21023202321 - 2⁹ = 21023201809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023202294 and 21023202303.

It is not an unprimeable number, because it can be changed into a prime (21023202323) 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, 562090 + ... + 598323.

It is an arithmetic number, because the mean of its divisors is an integer number (1079185020).

Almost surely, 2^21023202321 is an apocalyptic number.

It is an amenable number.

21023202321 is a deficient number, since it is larger than the sum of its proper divisors (13510718319).

21023202321 is a wasteful number, since it uses less digits than its factorization.

21023202321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160494 (or 1160488 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21023202321 its reverse (12320232012), we get a palindrome (33343434333).

The spelling of 21023202321 in words is "twenty-one billion, twenty-three million, two hundred two thousand, three hundred twenty-one".