21965004 has 36 divisors (see below), whose sum is σ = 55678896. Its totient is φ = 7301088.

The previous prime is 21964979. The next prime is 21965017. The reversal of 21965004 is 40056912.

21965004 is a `hidden beast` number, since 2 + 1 + 9 + 650 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21965004² = 964922801440032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17502 + ... + 18714.

It is an arithmetic number, because the mean of its divisors is an integer number (1546636).

Almost surely, 2^21965004 is an apocalyptic number.

It is an amenable number.

21965004 is an abundant number, since it is smaller than the sum of its proper divisors (33713892).

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

21965004 is a wasteful number, since it uses less digits than its factorization.

21965004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726 (or 1721 counting only the distinct ones).

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

The square root of 21965004 is about 4686.6836889212. The cubic root of 21965004 is about 280.0552782018.

The spelling of 21965004 in words is "twenty-one million, nine hundred sixty-five thousand, four".