21400708 has 24 divisors (see below), whose sum is σ = 42940800. Its totient is φ = 9141888.

The previous prime is 21400681. The next prime is 21400723. The reversal of 21400708 is 80700412.

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, 8988 + ... + 11116.

It is an arithmetic number, because the mean of its divisors is an integer number (1789200).

Almost surely, 2^21400708 is an apocalyptic number.

21400708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21400708 is an abundant number, since it is smaller than the sum of its proper divisors (21540092).

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

21400708 is a wasteful number, since it uses less digits than its factorization.

21400708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499 (or 2497 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 21400708 is about 4626.0899256283. The cubic root of 21400708 is about 277.6361715691.

The spelling of 21400708 in words is "twenty-one million, four hundred thousand, seven hundred eight".