21231112311 has 8 divisors (see below), whose sum is σ = 31453499760. Its totient is φ = 14154074856.

The previous prime is 21231112249. The next prime is 21231112361. The reversal of 21231112311 is 11321113212.

21231112311 is a `hidden beast` number, since 212 + 31 + 112 + 311 = 666.

It is not a de Polignac number, because 21231112311 - 2⁹ = 21231111799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231112361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393168720 + ... + 393168773.

It is an arithmetic number, because the mean of its divisors is an integer number (3931687470).

Almost surely, 2^21231112311 is an apocalyptic number.

21231112311 is a deficient number, since it is larger than the sum of its proper divisors (10222387449).

21231112311 is an equidigital number, since it uses as much as digits as its factorization.

21231112311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786337502 (or 786337496 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 21231112311 its reverse (11321113212), we get a palindrome (32552225523).

Subtracting from 21231112311 its reverse (11321113212), we obtain a palindrome (9909999099).

The spelling of 21231112311 in words is "twenty-one billion, two hundred thirty-one million, one hundred twelve thousand, three hundred eleven".