21086996 has 24 divisors (see below), whose sum is σ = 42712320. Its totient is φ = 8921952.

The previous prime is 21086981. The next prime is 21087019. The reversal of 21086996 is 69968012.

It is a super-2 number, since 2×21086996² = 889322800608032, which contains 22 as substring.

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, 2555 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (1779680).

Almost surely, 2^21086996 is an apocalyptic number.

It is an amenable number.

21086996 is an abundant number, since it is smaller than the sum of its proper divisors (21625324).

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

21086996 is a wasteful number, since it uses less digits than its factorization.

21086996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623 (or 9621 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 21086996 is about 4592.0579264639. The cubic root of 21086996 is about 276.2728695330.

The spelling of 21086996 in words is "twenty-one million, eighty-six thousand, nine hundred ninety-six".