21055996 has 24 divisors (see below), whose sum is σ = 42018480. Its totient is φ = 9146112.

The previous prime is 21055967. The next prime is 21056011. The reversal of 21055996 is 69955012.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11026 + ... + 12793.

It is an arithmetic number, because the mean of its divisors is an integer number (1750770).

Almost surely, 2^21055996 is an apocalyptic number.

21055996 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21055996 is a deficient number, since it is larger than the sum of its proper divisors (20962484).

21055996 is a wasteful number, since it uses less digits than its factorization.

21055996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23853 (or 23851 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 21055996 is about 4588.6812920489. The cubic root of 21055996 is about 276.1374201901.

The spelling of 21055996 in words is "twenty-one million, fifty-five thousand, nine hundred ninety-six".