21233431313111 has 6 divisors (see below), whose sum is σ = 21990866438112. Its totient is φ = 20501244025640.

The previous prime is 21233431313089. The next prime is 21233431313117. The reversal of 21233431313111 is 11131313433212.

It is not a de Polignac number, because 21233431313111 - 2¹⁰ = 21233431312087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233431313117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12623917895 + ... + 12623919576.

It is an arithmetic number, because the mean of its divisors is an integer number (3665144406352).

Almost surely, 2^{21233431313111} is an apocalyptic number.

21233431313111 is a deficient number, since it is larger than the sum of its proper divisors (757435125001).

21233431313111 is an equidigital number, since it uses as much as digits as its factorization.

21233431313111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25247837529 (or 25247837500 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

Adding to 21233431313111 its reverse (11131313433212), we get a palindrome (32364744746323).

The spelling of 21233431313111 in words is "twenty-one trillion, two hundred thirty-three billion, four hundred thirty-one million, three hundred thirteen thousand, one hundred eleven".