21195275 has 12 divisors (see below), whose sum is σ = 26654544. Its totient is φ = 16716000.

The previous prime is 21195257. The next prime is 21195299. The reversal of 21195275 is 57259112.

It is a happy number.

It is not a de Polignac number, because 21195275 - 2⁸ = 21195019 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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4196 + ... + 7745.

It is an arithmetic number, because the mean of its divisors is an integer number (2221212).

Almost surely, 2^21195275 is an apocalyptic number.

21195275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21195275 is a deficient number, since it is larger than the sum of its proper divisors (5459269).

21195275 is a wasteful number, since it uses less digits than its factorization.

21195275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12022 (or 12017 counting only the distinct ones).

The product of its digits is 6300, while the sum is 32.

The square root of 21195275 is about 4603.8326424839. The cubic root of 21195275 is about 276.7449376132.

The spelling of 21195275 in words is "twenty-one million, one hundred ninety-five thousand, two hundred seventy-five".