21695275 has 12 divisors (see below), whose sum is σ = 30745552. Its totient is φ = 14876640.

The previous prime is 21695269. The next prime is 21695291. The reversal of 21695275 is 57259612.

It is not a de Polignac number, because 21695275 - 2⁵ = 21695243 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61812 + ... + 62161.

Almost surely, 2^21695275 is an apocalyptic number.

21695275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21695275 is a deficient number, since it is larger than the sum of its proper divisors (9050277).

21695275 is a wasteful number, since it uses less digits than its factorization.

21695275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123990 (or 123985 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 21695275 is about 4657.8186954840. The cubic root of 21695275 is about 278.9041992398.

The spelling of 21695275 in words is "twenty-one million, six hundred ninety-five thousand, two hundred seventy-five".