21013104756 has 24 divisors (see below), whose sum is σ = 56034946240. Its totient is φ = 6003744192.

The previous prime is 21013104653. The next prime is 21013104769. The reversal of 21013104756 is 65740131012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125077921 + ... + 125078088.

Almost surely, 2^21013104756 is an apocalyptic number.

It is an amenable number.

21013104756 is an abundant number, since it is smaller than the sum of its proper divisors (35021841484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21013104756 is a wasteful number, since it uses less digits than its factorization.

21013104756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250156023 (or 250156021 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

Adding to 21013104756 its reverse (65740131012), we get a palindrome (86753235768).

The spelling of 21013104756 in words is "twenty-one billion, thirteen million, one hundred four thousand, seven hundred fifty-six".