21838574765 has 64 divisors (see below), whose sum is σ = 33038046720. Its totient is φ = 13516431360.

The previous prime is 21838574717. The next prime is 21838574777. The reversal of 21838574765 is 56747583812.

It is not a de Polignac number, because 21838574765 - 2⁶ = 21838574701 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21838574765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1431719 + ... + 1446891.

It is an arithmetic number, because the mean of its divisors is an integer number (516219480).

Almost surely, 2^21838574765 is an apocalyptic number.

It is an amenable number.

21838574765 is a deficient number, since it is larger than the sum of its proper divisors (11199471955).

21838574765 is a wasteful number, since it uses less digits than its factorization.

21838574765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15302.

The product of its digits is 11289600, while the sum is 56.

The spelling of 21838574765 in words is "twenty-one billion, eight hundred thirty-eight million, five hundred seventy-four thousand, seven hundred sixty-five".