21303123104 has 24 divisors (see below), whose sum is σ = 41943781908. Its totient is φ = 10650734080.

The previous prime is 21303123067. The next prime is 21303123143. The reversal of 21303123104 is 40132130312.

It can be written as a sum of positive squares in 2 ways, for example, as 16965583504 + 4337539600 = 130252^2 + 65860^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758594 + ... + 786174.

Almost surely, 2^21303123104 is an apocalyptic number.

It is an amenable number.

21303123104 is a deficient number, since it is larger than the sum of its proper divisors (20640658804).

21303123104 is a wasteful number, since it uses less digits than its factorization.

21303123104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51728 (or 51720 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21303123104 its reverse (40132130312), we get a palindrome (61435253416).

The spelling of 21303123104 in words is "twenty-one billion, three hundred three million, one hundred twenty-three thousand, one hundred four".