21113332311 has 16 divisors (see below), whose sum is σ = 28916176608. Its totient is φ = 13693132800.

The previous prime is 21113332307. The next prime is 21113332313. The reversal of 21113332311 is 11323331112.

It is a happy number.

It is not a de Polignac number, because 21113332311 - 2² = 21113332307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113332313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342051 + ... + 1357691.

It is an arithmetic number, because the mean of its divisors is an integer number (1807261038).

Almost surely, 2^21113332311 is an apocalyptic number.

21113332311 is a deficient number, since it is larger than the sum of its proper divisors (7802844297).

21113332311 is a wasteful number, since it uses less digits than its factorization.

21113332311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27842.

The product of its digits is 324, while the sum is 21.

Adding to 21113332311 its reverse (11323331112), we get a palindrome (32436663423).

The spelling of 21113332311 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty-two thousand, three hundred eleven".