21616360604116 has 6 divisors (see below), whose sum is σ = 37828631057210. Its totient is φ = 10808180302056.

The previous prime is 21616360604029. The next prime is 21616360604117. The reversal of 21616360604116 is 61140606361612.

It can be written as a sum of positive squares in only one way, i.e., 14113395968400 + 7502964635716 = 3756780^2 + 2739154^2 .

It is a super-2 number, since 2×21616360604116² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616360604117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2702045075511 + ... + 2702045075518.

Almost surely, 2^{21616360604116} is an apocalyptic number.

It is an amenable number.

21616360604116 is a deficient number, since it is larger than the sum of its proper divisors (16212270453094).

21616360604116 is a wasteful number, since it uses less digits than its factorization.

21616360604116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404090151033 (or 5404090151031 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

Adding to 21616360604116 its reverse (61140606361612), we get a palindrome (82756966965728).

The spelling of 21616360604116 in words is "twenty-one trillion, six hundred sixteen billion, three hundred sixty million, six hundred four thousand, one hundred sixteen".