21311122311 has 48 divisors (see below), whose sum is σ = 31950277632. Its totient is φ = 13678656000.

The previous prime is 21311122309. The next prime is 21311122379. The reversal of 21311122311 is 11322111312.

21311122311 is a `hidden beast` number, since 21 + 311 + 1 + 22 + 311 = 666.

It is not a de Polignac number, because 21311122311 - 2¹ = 21311122309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311124311) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14273281 + ... + 14274773.

It is an arithmetic number, because the mean of its divisors is an integer number (665630784).

Almost surely, 2^21311122311 is an apocalyptic number.

21311122311 is a deficient number, since it is larger than the sum of its proper divisors (10639155321).

21311122311 is a wasteful number, since it uses less digits than its factorization.

21311122311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024 (or 2021 counting only the distinct ones).

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

Adding to 21311122311 its reverse (11322111312), we get a palindrome (32633233623).

The spelling of 21311122311 in words is "twenty-one billion, three hundred eleven million, one hundred twenty-two thousand, three hundred eleven".