21311412421231 has 2 divisors, whose sum is σ = 21311412421232. Its totient is φ = 21311412421230.

The previous prime is 21311412421207. The next prime is 21311412421237. The reversal of 21311412421231 is 13212421411312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21311412421231 - 2⁵ = 21311412421199 is a prime.

It is a super-2 number, since 2×21311412421231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21311412421231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311412421237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655706210615 + 10655706210616.

It is an arithmetic number, because the mean of its divisors is an integer number (10655706210616).

Almost surely, 2^{21311412421231} is an apocalyptic number.

21311412421231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311412421231 is an equidigital number, since it uses as much as digits as its factorization.

21311412421231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

Adding to 21311412421231 its reverse (13212421411312), we get a palindrome (34523833832543).

The spelling of 21311412421231 in words is "twenty-one trillion, three hundred eleven billion, four hundred twelve million, four hundred twenty-one thousand, two hundred thirty-one".