21370704 has 40 divisors (see below), whose sum is σ = 55389312. Its totient is φ = 7100160.

The previous prime is 21370693. The next prime is 21370721. The reversal of 21370704 is 40707312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20172 + ... + 21204.

Almost surely, 2^21370704 is an apocalyptic number.

21370704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21370704 is an abundant number, since it is smaller than the sum of its proper divisors (34018608).

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

21370704 is a wasteful number, since it uses less digits than its factorization.

21370704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21370704 is about 4622.8458767300. The cubic root of 21370704 is about 277.5063613508.

The spelling of 21370704 in words is "twenty-one million, three hundred seventy thousand, seven hundred four".