21300537756 has 24 divisors (see below), whose sum is σ = 49706616960. Its totient is φ = 7099413232.

The previous prime is 21300537701. The next prime is 21300537773. The reversal of 21300537756 is 65773500312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26335 + ... + 208073.

It is an arithmetic number, because the mean of its divisors is an integer number (2071109040).

Almost surely, 2^21300537756 is an apocalyptic number.

It is an amenable number.

21300537756 is an abundant number, since it is smaller than the sum of its proper divisors (28406079204).

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

21300537756 is a wasteful number, since it uses less digits than its factorization.

21300537756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191513 (or 191511 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 39.

The spelling of 21300537756 in words is "twenty-one billion, three hundred million, five hundred thirty-seven thousand, seven hundred fifty-six".