21459004 has 12 divisors (see below), whose sum is σ = 42918064. Its totient is φ = 9196704.

The previous prime is 21458989. The next prime is 21459073. The reversal of 21459004 is 40095412.

21459004 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21459004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383169 + ... + 383224.

Almost surely, 2^21459004 is an apocalyptic number.

It is an amenable number.

21459004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21459004 is a wasteful number, since it uses less digits than its factorization.

21459004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766404 (or 766402 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21459004 is about 4632.3864260228. The cubic root of 21459004 is about 277.8880386925. Note that the first 3 decimals are identical.

The spelling of 21459004 in words is "twenty-one million, four hundred fifty-nine thousand, four".