21310756337 has 16 divisors (see below), whose sum is σ = 23447746560. Its totient is φ = 19249114752.

The previous prime is 21310756333. The next prime is 21310756349. The reversal of 21310756337 is 73365701312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21310756337 - 2² = 21310756333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21310756337.

It is not an unprimeable number, because it can be changed into a prime (21310756333) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 32114 + ... + 208932.

It is an arithmetic number, because the mean of its divisors is an integer number (1465484160).

Almost surely, 2^21310756337 is an apocalyptic number.

It is an amenable number.

21310756337 is a deficient number, since it is larger than the sum of its proper divisors (2136990223).

21310756337 is a wasteful number, since it uses less digits than its factorization.

21310756337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177032.

The product of its (nonzero) digits is 79380, while the sum is 38.

The spelling of 21310756337 in words is "twenty-one billion, three hundred ten million, seven hundred fifty-six thousand, three hundred thirty-seven".