21900700 has 36 divisors (see below), whose sum is σ = 47731320. Its totient is φ = 8722240.

The previous prime is 21900691. The next prime is 21900737. The reversal of 21900700 is 700912.

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 11 ways as a sum of consecutive naturals, for example, 38619 + ... + 39181.

It is an arithmetic number, because the mean of its divisors is an integer number (1325870).

Almost surely, 2^21900700 is an apocalyptic number.

21900700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21900700 is an abundant number, since it is smaller than the sum of its proper divisors (25830620).

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

21900700 is a wasteful number, since it uses less digits than its factorization.

21900700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 21900700 is about 4679.8183725440. The cubic root of 21900700 is about 279.7817176308.

The spelling of 21900700 in words is "twenty-one million, nine hundred thousand, seven hundred".