231020112021111 has 192 divisors, whose sum is σ = 435057213127680. Its totient is φ = 114937809960960.

The previous prime is 231020112021079. The next prime is 231020112021113. The reversal of 231020112021111 is 111120211020132.

It is a happy number.

231020112021111 is a `hidden beast` number, since 2 + 310 + 20 + 1 + 120 + 211 + 1 + 1 = 666.

It is not a de Polignac number, because 231020112021111 - 2⁵ = 231020112021079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231020112021113) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3353867391 + ... + 3353936271.

It is an arithmetic number, because the mean of its divisors is an integer number (2265922985040).

Almost surely, 2^{231020112021111} is an apocalyptic number.

231020112021111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231020112021111 is a deficient number, since it is larger than the sum of its proper divisors (204037101106569).

231020112021111 is a wasteful number, since it uses less digits than its factorization.

231020112021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72806 (or 72803 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 231020112021111 its reverse (111120211020132), we get a palindrome (342140323041243).

The spelling of 231020112021111 in words is "two hundred thirty-one trillion, twenty billion, one hundred twelve million, twenty-one thousand, one hundred eleven".