21455004 has 24 divisors (see below), whose sum is σ = 50176000. Its totient is φ = 7135344.

The previous prime is 21454997. The next prime is 21455011. The reversal of 21455004 is 40055412.

It is an interprime number because it is at equal distance from previous prime (21454997) and next prime (21455011).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4197 + ... + 7779.

Almost surely, 2^21455004 is an apocalyptic number.

It is an amenable number.

21455004 is an abundant number, since it is smaller than the sum of its proper divisors (28720996).

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

21455004 is a wasteful number, since it uses less digits than its factorization.

21455004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4089 (or 4087 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 21455004 is about 4631.9546629906. The cubic root of 21455004 is about 277.8707713296.

The spelling of 21455004 in words is "twenty-one million, four hundred fifty-five thousand, four".