21180599911 has 2 divisors, whose sum is σ = 21180599912. Its totient is φ = 21180599910.

The previous prime is 21180599899. The next prime is 21180600017. The reversal of 21180599911 is 11999508112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21180599911 - 2²³ = 21172211303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21180599411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10590299955 + 10590299956.

It is an arithmetic number, because the mean of its divisors is an integer number (10590299956).

Almost surely, 2^21180599911 is an apocalyptic number.

21180599911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21180599911 is an equidigital number, since it uses as much as digits as its factorization.

21180599911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 46.

The spelling of 21180599911 in words is "twenty-one billion, one hundred eighty million, five hundred ninety-nine thousand, nine hundred eleven".