21939992895745 has 16 divisors (see below), whose sum is σ = 27082983432960. Its totient is φ = 17052248752000.

The previous prime is 21939992895719. The next prime is 21939992895757. The reversal of 21939992895745 is 54759829993912.

It is not a de Polignac number, because 21939992895745 - 2⁵ = 21939992895713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223851331 + ... + 223949320.

It is an arithmetic number, because the mean of its divisors is an integer number (1692686464560).

Almost surely, 2^{21939992895745} is an apocalyptic number.

It is an amenable number.

21939992895745 is a deficient number, since it is larger than the sum of its proper divisors (5142990537215).

21939992895745 is a wasteful number, since it uses less digits than its factorization.

21939992895745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447800936.

The product of its digits is 3968092800, while the sum is 82.

The spelling of 21939992895745 in words is "twenty-one trillion, nine hundred thirty-nine billion, nine hundred ninety-two million, eight hundred ninety-five thousand, seven hundred forty-five".