21470684 has 48 divisors (see below), whose sum is σ = 42094080. Its totient is φ = 9535680.

The previous prime is 21470653. The next prime is 21470723. The reversal of 21470684 is 48607412.

It is a self number, because there is not a number n which added to its sum of digits gives 21470684.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124022 + ... + 124194.

It is an arithmetic number, because the mean of its divisors is an integer number (876960).

Almost surely, 2^21470684 is an apocalyptic number.

It is an amenable number.

21470684 is a deficient number, since it is larger than the sum of its proper divisors (20623396).

21470684 is a wasteful number, since it uses less digits than its factorization.

21470684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21470684 is about 4633.6469438230. The cubic root of 21470684 is about 277.9384471146.

The spelling of 21470684 in words is "twenty-one million, four hundred seventy thousand, six hundred eighty-four".