21046684 has 6 divisors (see below), whose sum is σ = 36831704. Its totient is φ = 10523340.

The previous prime is 21046681. The next prime is 21046709. The reversal of 21046684 is 48664012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630832 + ... + 2630839.

Almost surely, 2^21046684 is an apocalyptic number.

It is an amenable number.

21046684 is a deficient number, since it is larger than the sum of its proper divisors (15785020).

21046684 is a wasteful number, since it uses less digits than its factorization.

21046684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261675 (or 5261673 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 21046684 is about 4587.6665092397. Note that the first 3 decimals coincide. The cubic root of 21046684 is about 276.0967069919.

The spelling of 21046684 in words is "twenty-one million, forty-six thousand, six hundred eighty-four".