21112131311 has 2 divisors, whose sum is σ = 21112131312. Its totient is φ = 21112131310.

The previous prime is 21112131269. The next prime is 21112131361. The reversal of 21112131311 is 11313121112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112131311 - 2²⁶ = 21045022447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112131311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112131361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556065655 + 10556065656.

It is an arithmetic number, because the mean of its divisors is an integer number (10556065656).

Almost surely, 2^21112131311 is an apocalyptic number.

21112131311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112131311 is an equidigital number, since it uses as much as digits as its factorization.

21112131311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 17.

Adding to 21112131311 its reverse (11313121112), we get a palindrome (32425252423).

The spelling of 21112131311 in words is "twenty-one billion, one hundred twelve million, one hundred thirty-one thousand, three hundred eleven".