21616232601312 has 60 divisors (see below), whose sum is σ = 63572739637176. Its totient is φ = 7205410866240.

The previous prime is 21616232601251. The next prime is 21616232601317. The reversal of 21616232601312 is 21310623261612.

21616232601312 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 6 + 2 + 32 + 601 + 3 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616232601317) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4169795364 + ... + 4169800547.

Almost surely, 2^{21616232601312} is an apocalyptic number.

It is an amenable number.

21616232601312 is an abundant number, since it is smaller than the sum of its proper divisors (41956507035864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21616232601312 is an equidigital number, since it uses as much as digits as its factorization.

21616232601312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8339595933 (or 8339595916 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Adding to 21616232601312 its reverse (21310623261612), we get a palindrome (42926855862924).

The spelling of 21616232601312 in words is "twenty-one trillion, six hundred sixteen billion, two hundred thirty-two million, six hundred one thousand, three hundred twelve".