21867004 has 12 divisors (see below), whose sum is σ = 38791984. Its totient is φ = 10783584.

The previous prime is 21866989. The next prime is 21867019. The reversal of 21867004 is 40076812.

It is an interprime number because it is at equal distance from previous prime (21866989) and next prime (21867019).

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, 37152 + ... + 37735.

Almost surely, 2^21867004 is an apocalyptic number.

It is an amenable number.

21867004 is a deficient number, since it is larger than the sum of its proper divisors (16924980).

21867004 is a wasteful number, since it uses less digits than its factorization.

21867004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74964 (or 74962 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21867004 is about 4676.2168469822. The cubic root of 21867004 is about 279.6381550369.

The spelling of 21867004 in words is "twenty-one million, eight hundred sixty-seven thousand, four".