21875764716 has 48 divisors (see below), whose sum is σ = 61077637600. Its totient is φ = 6731004096.

The previous prime is 21875764667. The next prime is 21875764733. The reversal of 21875764716 is 61746757812.

21875764716 is a `hidden beast` number, since 2 + 18 + 7 + 576 + 47 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 7789111 + ... + 7791918.

Almost surely, 2^21875764716 is an apocalyptic number.

21875764716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21875764716 is an abundant number, since it is smaller than the sum of its proper divisors (39201872884).

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

21875764716 is a wasteful number, since it uses less digits than its factorization.

21875764716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15581055 (or 15581047 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The spelling of 21875764716 in words is "twenty-one billion, eight hundred seventy-five million, seven hundred sixty-four thousand, seven hundred sixteen".