21913435017937 has 16 divisors (see below), whose sum is σ = 22523862620160. Its totient is φ = 21307651142400.

The previous prime is 21913435017931. The next prime is 21913435017961. The reversal of 21913435017937 is 73971053431912.

It is a cyclic number.

It is not a de Polignac number, because 21913435017937 - 2³¹ = 21911287534289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21913435017931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29782512 + ... + 30509422.

It is an arithmetic number, because the mean of its divisors is an integer number (1407741413760).

Almost surely, 2^{21913435017937} is an apocalyptic number.

It is an amenable number.

21913435017937 is a deficient number, since it is larger than the sum of its proper divisors (610427602223).

21913435017937 is a wasteful number, since it uses less digits than its factorization.

21913435017937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730104.

The product of its (nonzero) digits is 4286520, while the sum is 55.

The spelling of 21913435017937 in words is "twenty-one trillion, nine hundred thirteen billion, four hundred thirty-five million, seventeen thousand, nine hundred thirty-seven".