231323312121111 has 72 divisors (see below), whose sum is σ = 433210524767280. Its totient is φ = 117861324811776.

The previous prime is 231323312121107. The next prime is 231323312121131. The reversal of 231323312121111 is 111121213323132.

231323312121111 is a `hidden beast` number, since 2 + 3 + 1 + 3 + 2 + 331 + 212 + 1 + 111 = 666.

It is not a de Polignac number, because 231323312121111 - 2² = 231323312121107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231323312121131) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 811843096 + ... + 812127981.

It is an arithmetic number, because the mean of its divisors is an integer number (6016812843990).

Almost surely, 2^{231323312121111} is an apocalyptic number.

231323312121111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231323312121111 is a deficient number, since it is larger than the sum of its proper divisors (201887212646169).

231323312121111 is a wasteful number, since it uses less digits than its factorization.

231323312121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623971133 (or 1623971123 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

Adding to 231323312121111 its reverse (111121213323132), we get a palindrome (342444525444243).

The spelling of 231323312121111 in words is "two hundred thirty-one trillion, three hundred twenty-three billion, three hundred twelve million, one hundred twenty-one thousand, one hundred eleven".