21893875 has 16 divisors (see below), whose sum is σ = 28933632. Its totient is φ = 16483200.

The previous prime is 21893831. The next prime is 21893887. The reversal of 21893875 is 57839812.

It is not a de Polignac number, because 21893875 - 2⁷ = 21893747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3027 + ... + 7276.

It is an arithmetic number, because the mean of its divisors is an integer number (1808352).

Almost surely, 2^21893875 is an apocalyptic number.

21893875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21893875 is a deficient number, since it is larger than the sum of its proper divisors (7039757).

21893875 is a wasteful number, since it uses less digits than its factorization.

21893875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335 (or 10325 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 21893875 is about 4679.0891207584. The cubic root of 21893875 is about 279.7526514577.

The spelling of 21893875 in words is "twenty-one million, eight hundred ninety-three thousand, eight hundred seventy-five".