21616065251156 has 48 divisors (see below), whose sum is σ = 40224658118400. Its totient is φ = 10128836809728.

The previous prime is 21616065251129. The next prime is 21616065251161. The reversal of 21616065251156 is 65115256061612.

It is a self number, because there is not a number n which added to its sum of digits gives 21616065251156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14502725 + ... + 15923603.

It is an arithmetic number, because the mean of its divisors is an integer number (838013710800).

Almost surely, 2^{21616065251156} is an apocalyptic number.

It is an amenable number.

21616065251156 is a deficient number, since it is larger than the sum of its proper divisors (18608592867244).

21616065251156 is a wasteful number, since it uses less digits than its factorization.

21616065251156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421856 (or 1421854 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 47.

The spelling of 21616065251156 in words is "twenty-one trillion, six hundred sixteen billion, sixty-five million, two hundred fifty-one thousand, one hundred fifty-six".