21613552616 has 32 divisors (see below), whose sum is σ = 43149024000. Its totient is φ = 10114250496.

The previous prime is 21613552613. The next prime is 21613552643. The reversal of 21613552616 is 61625531612.

It is a self number, because there is not a number n which added to its sum of digits gives 21613552616.

It is not an unprimeable number, because it can be changed into a prime (21613552613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419576 + ... + 468263.

It is an arithmetic number, because the mean of its divisors is an integer number (1348407000).

Almost surely, 2^21613552616 is an apocalyptic number.

It is an amenable number.

21613552616 is a deficient number, since it is larger than the sum of its proper divisors (21535471384).

21613552616 is a wasteful number, since it uses less digits than its factorization.

21613552616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888041 (or 888037 counting only the distinct ones).

The product of its digits is 64800, while the sum is 38.

The spelling of 21613552616 in words is "twenty-one billion, six hundred thirteen million, five hundred fifty-two thousand, six hundred sixteen".