31233012211111 has 4 divisors (see below), whose sum is σ = 32590969263792. Its totient is φ = 29875055158432.

The previous prime is 31233012211099. The next prime is 31233012211151. The reversal of 31233012211111 is 11111221033213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31233012211111 - 2¹³ = 31233012202919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31233012211151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678978526306 + ... + 678978526351.

It is an arithmetic number, because the mean of its divisors is an integer number (8147742315948).

Almost surely, 2^{31233012211111} is an apocalyptic number.

31233012211111 is a deficient number, since it is larger than the sum of its proper divisors (1357957052681).

31233012211111 is a wasteful number, since it uses less digits than its factorization.

31233012211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357957052680.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31233012211111 its reverse (11111221033213), we get a palindrome (42344233244324).

The spelling of 31233012211111 in words is "thirty-one trillion, two hundred thirty-three billion, twelve million, two hundred eleven thousand, one hundred eleven".