21600456 has 16 divisors (see below), whose sum is σ = 54001200. Its totient is φ = 7200144.

The previous prime is 21600451. The next prime is 21600463. The reversal of 21600456 is 65400612.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 900019 = 21600456 / (2 + 1 + 6 + 0 + 0 + 4 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (21600451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449986 + ... + 450033.

It is an arithmetic number, because the mean of its divisors is an integer number (3375075).

Almost surely, 2^21600456 is an apocalyptic number.

It is an amenable number.

21600456 is an abundant number, since it is smaller than the sum of its proper divisors (32400744).

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

21600456 is a wasteful number, since it uses less digits than its factorization.

21600456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900028 (or 900024 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21600456 is about 4647.6290729790. The cubic root of 21600456 is about 278.4972897849.

The spelling of 21600456 in words is "twenty-one million, six hundred thousand, four hundred fifty-six".