21293206684 has 6 divisors (see below), whose sum is σ = 37263111704. Its totient is φ = 10646603340.

The previous prime is 21293206667. The next prime is 21293206717. The reversal of 21293206684 is 48660239212.

It is a self number, because there is not a number n which added to its sum of digits gives 21293206684.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2661650832 + ... + 2661650839.

Almost surely, 2^21293206684 is an apocalyptic number.

It is an amenable number.

21293206684 is a deficient number, since it is larger than the sum of its proper divisors (15969905020).

21293206684 is a wasteful number, since it uses less digits than its factorization.

21293206684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5323301675 (or 5323301673 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 21293206684 in words is "twenty-one billion, two hundred ninety-three million, two hundred six thousand, six hundred eighty-four".