21631368911 has 2 divisors, whose sum is σ = 21631368912. Its totient is φ = 21631368910.

The previous prime is 21631368851. The next prime is 21631368937. The reversal of 21631368911 is 11986313612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21631368911 - 2¹⁰ = 21631367887 is a prime.

It is a super-2 number, since 2×21631368911² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21631368211) 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, 10815684455 + 10815684456.

It is an arithmetic number, because the mean of its divisors is an integer number (10815684456).

Almost surely, 2^21631368911 is an apocalyptic number.

21631368911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21631368911 is an equidigital number, since it uses as much as digits as its factorization.

21631368911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The spelling of 21631368911 in words is "twenty-one billion, six hundred thirty-one million, three hundred sixty-eight thousand, nine hundred eleven".