21613312775591 has 2 divisors, whose sum is σ = 21613312775592. Its totient is φ = 21613312775590.

The previous prime is 21613312775491. The next prime is 21613312775629. The reversal of 21613312775591 is 19557721331612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21613312775591 - 2¹⁰ = 21613312774567 is a prime.

It is a super-3 number, since 3×21613312775591³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21613312775491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806656387795 + 10806656387796.

It is an arithmetic number, because the mean of its divisors is an integer number (10806656387796).

Almost surely, 2^{21613312775591} is an apocalyptic number.

21613312775591 is a deficient number, since it is larger than the sum of its proper divisors (1).

21613312775591 is an equidigital number, since it uses as much as digits as its factorization.

21613312775591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 53.

The spelling of 21613312775591 in words is "twenty-one trillion, six hundred thirteen billion, three hundred twelve million, seven hundred seventy-five thousand, five hundred ninety-one".