21358704 has 40 divisors (see below), whose sum is σ = 56527632. Its totient is φ = 6945280.

The previous prime is 21358699. The next prime is 21358739. The reversal of 21358704 is 40785312.

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, 3459 + ... + 7394.

Almost surely, 2^21358704 is an apocalyptic number.

21358704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21358704 is an abundant number, since it is smaller than the sum of its proper divisors (35168928).

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

21358704 is a wasteful number, since it uses less digits than its factorization.

21358704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10905 (or 10899 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21358704 is about 4621.5477926773. The cubic root of 21358704 is about 277.4544101715.

The spelling of 21358704 in words is "twenty-one million, three hundred fifty-eight thousand, seven hundred four".