21394684 has 12 divisors (see below), whose sum is σ = 39411400. Its totient is φ = 10134288.

The previous prime is 21394679. The next prime is 21394691. The reversal of 21394684 is 48649312.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140679 + ... + 140830.

Almost surely, 2^21394684 is an apocalyptic number.

It is an amenable number.

21394684 is a deficient number, since it is larger than the sum of its proper divisors (18016716).

21394684 is a wasteful number, since it uses less digits than its factorization.

21394684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281532 (or 281530 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 21394684 is about 4625.4387899960. The cubic root of 21394684 is about 277.6101188913.

The spelling of 21394684 in words is "twenty-one million, three hundred ninety-four thousand, six hundred eighty-four".