21118125599 has 2 divisors, whose sum is σ = 21118125600. Its totient is φ = 21118125598.

The previous prime is 21118125593. The next prime is 21118125617. The reversal of 21118125599 is 99552181112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21118125599 - 2²⁴ = 21101348383 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21118125593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10559062799 + 10559062800.

It is an arithmetic number, because the mean of its divisors is an integer number (10559062800).

Almost surely, 2^21118125599 is an apocalyptic number.

21118125599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21118125599 is an equidigital number, since it uses as much as digits as its factorization.

21118125599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 44.

The spelling of 21118125599 in words is "twenty-one billion, one hundred eighteen million, one hundred twenty-five thousand, five hundred ninety-nine".