21095756 has 24 divisors (see below), whose sum is σ = 40449024. Its totient is φ = 9547280.

The previous prime is 21095747. The next prime is 21095773. The reversal of 21095756 is 65759012.

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 7 ways as a sum of consecutive naturals, for example, 10661 + ... + 12483.

It is an arithmetic number, because the mean of its divisors is an integer number (1685376).

Almost surely, 2^21095756 is an apocalyptic number.

It is an amenable number.

21095756 is a deficient number, since it is larger than the sum of its proper divisors (19353268).

21095756 is a wasteful number, since it uses less digits than its factorization.

21095756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101 (or 2099 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 21095756 is about 4593.0116481455. The cubic root of 21095756 is about 276.3111208371.

The spelling of 21095756 in words is "twenty-one million, ninety-five thousand, seven hundred fifty-six".