21777795875 has 16 divisors (see below), whose sum is σ = 29649481056. Its totient is φ = 15838396000.

The previous prime is 21777795863. The next prime is 21777795901. The reversal of 21777795875 is 57859777712.

It is not a de Polignac number, because 21777795875 - 2⁶ = 21777795811 is a prime.

It is a Duffinian number.

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, 7917824 + ... + 7920573.

It is an arithmetic number, because the mean of its divisors is an integer number (1853092566).

Almost surely, 2^21777795875 is an apocalyptic number.

21777795875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21777795875 is a deficient number, since it is larger than the sum of its proper divisors (7871685181).

21777795875 is a wasteful number, since it uses less digits than its factorization.

21777795875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15838423 (or 15838413 counting only the distinct ones).

The product of its digits is 60505200, while the sum is 65.

The spelling of 21777795875 in words is "twenty-one billion, seven hundred seventy-seven million, seven hundred ninety-five thousand, eight hundred seventy-five".