21156675 has 12 divisors (see below), whose sum is σ = 34979160. Its totient is φ = 11283520.

The previous prime is 21156661. The next prime is 21156701. The reversal of 21156675 is 57665112.

It is not a de Polignac number, because 21156675 - 2⁸ = 21156419 is a prime.

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, 140970 + ... + 141119.

It is an arithmetic number, because the mean of its divisors is an integer number (2914930).

Almost surely, 2^21156675 is an apocalyptic number.

21156675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21156675 is a deficient number, since it is larger than the sum of its proper divisors (13822485).

21156675 is a wasteful number, since it uses less digits than its factorization.

21156675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282102 (or 282097 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 21156675 is about 4599.6385727576. The cubic root of 21156675 is about 276.5768365322.

The spelling of 21156675 in words is "twenty-one million, one hundred fifty-six thousand, six hundred seventy-five".