21748926465 has 96 divisors (see below), whose sum is σ = 45098726400. Its totient is φ = 9849034944.

The previous prime is 21748926439. The next prime is 21748926533. The reversal of 21748926465 is 56462984712.

21748926465 is a `hidden beast` number, since 2 + 174 + 8 + 9 + 2 + 6 + 465 = 666.

It is not a de Polignac number, because 21748926465 - 2⁷ = 21748926337 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 898086 + ... + 921984.

It is an arithmetic number, because the mean of its divisors is an integer number (469778400).

Almost surely, 2^21748926465 is an apocalyptic number.

It is an amenable number.

21748926465 is an abundant number, since it is smaller than the sum of its proper divisors (23349799935).

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

21748926465 is a wasteful number, since it uses less digits than its factorization.

21748926465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24033 (or 24021 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 21748926465 in words is "twenty-one billion, seven hundred forty-eight million, nine hundred twenty-six thousand, four hundred sixty-five".