21616231105499 has 2 divisors, whose sum is σ = 21616231105500. Its totient is φ = 21616231105498.

The previous prime is 21616231105493. The next prime is 21616231105517. The reversal of 21616231105499 is 99450113261612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21616231105499 - 2⁸ = 21616231105243 is a prime.

It is a super-2 number, since 2×21616231105499² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21616231105493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808115552749 + 10808115552750.

It is an arithmetic number, because the mean of its divisors is an integer number (10808115552750).

Almost surely, 2^{21616231105499} is an apocalyptic number.

21616231105499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616231105499 is an equidigital number, since it uses as much as digits as its factorization.

21616231105499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 21616231105499 in words is "twenty-one trillion, six hundred sixteen billion, two hundred thirty-one million, one hundred five thousand, four hundred ninety-nine".