21706364 has 12 divisors (see below), whose sum is σ = 38068800. Its totient is φ = 10829568.

The previous prime is 21706361. The next prime is 21706381. The reversal of 21706364 is 46360712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706361) 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, 3749 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (3172400).

Almost surely, 2^21706364 is an apocalyptic number.

It is an amenable number.

21706364 is a deficient number, since it is larger than the sum of its proper divisors (16362436).

21706364 is a wasteful number, since it uses less digits than its factorization.

21706364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11812 (or 11810 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 21706364 is about 4659.0089074824. The cubic root of 21706364 is about 278.9517094601.

The spelling of 21706364 in words is "twenty-one million, seven hundred six thousand, three hundred sixty-four".