21616603364 has 12 divisors (see below), whose sum is σ = 39133506300. Its totient is φ = 10435601568.

The previous prime is 21616603363. The next prime is 21616603387. The reversal of 21616603364 is 46330661612.

It can be written as a sum of positive squares in 2 ways, for example, as 3606963364 + 18009640000 = 60058^2 + 134200^2 .

It is a super-2 number, since 2×21616603364² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21616603361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93174899 + ... + 93175130.

It is an arithmetic number, because the mean of its divisors is an integer number (3261125525).

Almost surely, 2^21616603364 is an apocalyptic number.

It is an amenable number.

21616603364 is a deficient number, since it is larger than the sum of its proper divisors (17516902936).

21616603364 is a wasteful number, since it uses less digits than its factorization.

21616603364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186350062 (or 186350060 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 21616603364 in words is "twenty-one billion, six hundred sixteen million, six hundred three thousand, three hundred sixty-four".