21112211212231 has 2 divisors, whose sum is σ = 21112211212232. Its totient is φ = 21112211212230.

The previous prime is 21112211212187. The next prime is 21112211212271. The reversal of 21112211212231 is 13221211221112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112211212231 - 2²³ = 21112202823623 is a prime.

It is a super-2 number, since 2×21112211212231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112211212271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556105606115 + 10556105606116.

It is an arithmetic number, because the mean of its divisors is an integer number (10556105606116).

Almost surely, 2^{21112211212231} is an apocalyptic number.

21112211212231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112211212231 is an equidigital number, since it uses as much as digits as its factorization.

21112211212231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 22.

Adding to 21112211212231 its reverse (13221211221112), we get a palindrome (34333422433343).

The spelling of 21112211212231 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred thirty-one".