21900456 has 40 divisors (see below), whose sum is σ = 61343370. Its totient is φ = 7299936.

The previous prime is 21900433. The next prime is 21900469. The reversal of 21900456 is 65400912.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 2452356 = 4410^2 + 1566^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16251 + ... + 17546.

Almost surely, 2^21900456 is an apocalyptic number.

It is an amenable number.

21900456 is an abundant number, since it is smaller than the sum of its proper divisors (39442914).

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

21900456 is a wasteful number, since it uses less digits than its factorization.

21900456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33815 (or 33802 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21900456 is about 4679.7923030835. The cubic root of 21900456 is about 279.7806785926.

The spelling of 21900456 in words is "twenty-one million, nine hundred thousand, four hundred fifty-six".