21790875 has 16 divisors (see below), whose sum is σ = 36260640. Its totient is φ = 11621600.

The previous prime is 21790843. The next prime is 21790921. The reversal of 21790875 is 57809712.

It is not a de Polignac number, because 21790875 - 2⁵ = 21790843 is a prime.

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, 28680 + ... + 29429.

It is an arithmetic number, because the mean of its divisors is an integer number (2266290).

Almost surely, 2^21790875 is an apocalyptic number.

21790875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21790875 is a deficient number, since it is larger than the sum of its proper divisors (14469765).

21790875 is an equidigital number, since it uses as much as digits as its factorization.

21790875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58127 (or 58117 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 21790875 is about 4668.0697295563. The cubic root of 21790875 is about 279.3132617857.

The spelling of 21790875 in words is "twenty-one million, seven hundred ninety thousand, eight hundred seventy-five".