21075956 has 12 divisors (see below), whose sum is σ = 40236000. Its totient is φ = 9579960.

The previous prime is 21075947. The next prime is 21075979. The reversal of 21075956 is 65957012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239456 + ... + 239543.

It is an arithmetic number, because the mean of its divisors is an integer number (3353000).

Almost surely, 2^21075956 is an apocalyptic number.

It is an amenable number.

21075956 is a deficient number, since it is larger than the sum of its proper divisors (19160044).

21075956 is a wasteful number, since it uses less digits than its factorization.

21075956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479014 (or 479012 counting only the distinct ones).

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

The square root of 21075956 is about 4590.8556936589. The cubic root of 21075956 is about 276.2246473188.

The spelling of 21075956 in words is "twenty-one million, seventy-five thousand, nine hundred fifty-six".