21616036344065 has 32 divisors (see below), whose sum is σ = 27047232253440. Its totient is φ = 16572952940544.

The previous prime is 21616036344061. The next prime is 21616036344079. The reversal of 21616036344065 is 56044363061612.

It is a cyclic number.

It is not a de Polignac number, because 21616036344065 - 2² = 21616036344061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (21616036344061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2147984 + ... + 6917073.

It is an arithmetic number, because the mean of its divisors is an integer number (845226007920).

Almost surely, 2^{21616036344065} is an apocalyptic number.

It is an amenable number.

21616036344065 is a deficient number, since it is larger than the sum of its proper divisors (5431195909375).

21616036344065 is a wasteful number, since it uses less digits than its factorization.

21616036344065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9065321.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 21616036344065 in words is "twenty-one trillion, six hundred sixteen billion, thirty-six million, three hundred forty-four thousand, sixty-five".