21002302321 has 64 divisors (see below), whose sum is σ = 28653004800. Its totient is φ = 14864855040.

The previous prime is 21002302303. The next prime is 21002302337. The reversal of 21002302321 is 12320320012.

It is not a de Polignac number, because 21002302321 - 2²¹ = 21000205169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002302295 and 21002302304.

It is not an unprimeable number, because it can be changed into a prime (21002302351) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37303986 + ... + 37304548.

It is an arithmetic number, because the mean of its divisors is an integer number (447703200).

Almost surely, 2^21002302321 is an apocalyptic number.

It is an amenable number.

21002302321 is a deficient number, since it is larger than the sum of its proper divisors (7650702479).

21002302321 is a wasteful number, since it uses less digits than its factorization.

21002302321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002302321 its reverse (12320320012), we get a palindrome (33322622333).

It can be divided in two parts, 21002 and 302321, that added together give a palindrome (323323).

The spelling of 21002302321 in words is "twenty-one billion, two million, three hundred two thousand, three hundred twenty-one".