21370688 has 28 divisors (see below), whose sum is σ = 42623232. Its totient is φ = 10631040.

The previous prime is 21370681. The next prime is 21370693. The reversal of 21370688 is 88607312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21370681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13793 + ... + 15263.

Almost surely, 2^21370688 is an apocalyptic number.

It is an amenable number.

21370688 is a deficient number, since it is larger than the sum of its proper divisors (21252544).

21370688 is a wasteful number, since it uses less digits than its factorization.

21370688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21370688 is about 4622.8441461940. The cubic root of 21370688 is about 277.5062920955.

The spelling of 21370688 in words is "twenty-one million, three hundred seventy thousand, six hundred eighty-eight".