21106715612 has 12 divisors (see below), whose sum is σ = 37351772640. Its totient is φ = 10434780576.

The previous prime is 21106715599. The next prime is 21106715621. The reversal of 21106715612 is 21651760112.

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, 29643908 + ... + 29644619.

It is an arithmetic number, because the mean of its divisors is an integer number (3112647720).

Almost surely, 2^21106715612 is an apocalyptic number.

It is an amenable number.

21106715612 is a deficient number, since it is larger than the sum of its proper divisors (16245057028).

21106715612 is a wasteful number, since it uses less digits than its factorization.

21106715612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59288620 (or 59288618 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 21106715612 in words is "twenty-one billion, one hundred six million, seven hundred fifteen thousand, six hundred twelve".