21311454599 has 2 divisors, whose sum is σ = 21311454600. Its totient is φ = 21311454598.

The previous prime is 21311454581. The next prime is 21311454613. The reversal of 21311454599 is 99545411312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21311454599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311454799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655727299 + 10655727300.

It is an arithmetic number, because the mean of its divisors is an integer number (10655727300).

Almost surely, 2^21311454599 is an apocalyptic number.

21311454599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311454599 is an equidigital number, since it uses as much as digits as its factorization.

21311454599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The spelling of 21311454599 in words is "twenty-one billion, three hundred eleven million, four hundred fifty-four thousand, five hundred ninety-nine".