21073956 has 24 divisors (see below), whose sum is σ = 50317344. Its totient is φ = 6861120.

The previous prime is 21073933. The next prime is 21073967. The reversal of 21073956 is 65937012.

It is a super-2 number, since 2×21073956² = 888223242979872, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19905 + ... + 20936.

It is an arithmetic number, because the mean of its divisors is an integer number (2096556).

Almost surely, 2^21073956 is an apocalyptic number.

It is an amenable number.

21073956 is an abundant number, since it is smaller than the sum of its proper divisors (29243388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21073956 is a wasteful number, since it uses less digits than its factorization.

21073956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40891 (or 40889 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 21073956 is about 4590.6378641753. The cubic root of 21073956 is about 276.2159096089.

The spelling of 21073956 in words is "twenty-one million, seventy-three thousand, nine hundred fifty-six".