231220042311 has 16 divisors (see below), whose sum is σ = 310467188864. Its totient is φ = 153061125984.

The previous prime is 231220042279. The next prime is 231220042379. The reversal of 231220042311 is 113240022132.

It is not a de Polignac number, because 231220042311 - 2⁵ = 231220042279 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 (231220042381) 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, 532980 + ... + 864006.

It is an arithmetic number, because the mean of its divisors is an integer number (19404199304).

Almost surely, 2^231220042311 is an apocalyptic number.

231220042311 is a deficient number, since it is larger than the sum of its proper divisors (79247146553).

231220042311 is a wasteful number, since it uses less digits than its factorization.

231220042311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332670.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 231220042311 its reverse (113240022132), we get a palindrome (344460064443).

The spelling of 231220042311 in words is "two hundred thirty-one billion, two hundred twenty million, forty-two thousand, three hundred eleven".