21300684 has 24 divisors (see below), whose sum is σ = 49777728. Its totient is φ = 7089360.

The previous prime is 21300679. The next prime is 21300733. The reversal of 21300684 is 48600312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12279 + ... + 13905.

It is an arithmetic number, because the mean of its divisors is an integer number (2074072).

Almost surely, 2^21300684 is an apocalyptic number.

It is an amenable number.

21300684 is an abundant number, since it is smaller than the sum of its proper divisors (28477044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21300684 is a wasteful number, since it uses less digits than its factorization.

21300684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725 (or 2723 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21300684 is about 4615.2664061785. The cubic root of 21300684 is about 277.2029513542.

Adding to 21300684 its reverse (48600312), we get a palindrome (69900996).

The spelling of 21300684 in words is "twenty-one million, three hundred thousand, six hundred eighty-four".