21616612153 has 2 divisors, whose sum is σ = 21616612154. Its totient is φ = 21616612152.

The previous prime is 21616612117. The next prime is 21616612183. The reversal of 21616612153 is 35121661612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11426113449 + 10190498704 = 106893^2 + 100948^2 .

It is a cyclic number.

It is not a de Polignac number, because 21616612153 - 2²¹ = 21614515001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21616612183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808306076 + 10808306077.

It is an arithmetic number, because the mean of its divisors is an integer number (10808306077).

Almost surely, 2^21616612153 is an apocalyptic number.

It is an amenable number.

21616612153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616612153 is an equidigital number, since it uses as much as digits as its factorization.

21616612153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The spelling of 21616612153 in words is "twenty-one billion, six hundred sixteen million, six hundred twelve thousand, one hundred fifty-three".