123111212331 has 16 divisors (see below), whose sum is σ = 168595162400. Its totient is φ = 79850976768.

The previous prime is 123111212321. The next prime is 123111212333. The reversal of 123111212331 is 133212111321.

It is not a de Polignac number, because 123111212331 - 2²¹ = 123109115179 is a prime.

It is a super-2 number, since 2×123111212331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123111212298 and 123111212307.

It is not an unprimeable number, because it can be changed into a prime (123111212333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2861205 + ... + 2903913.

It is an arithmetic number, because the mean of its divisors is an integer number (10537197650).

Almost surely, 2^123111212331 is an apocalyptic number.

123111212331 is a deficient number, since it is larger than the sum of its proper divisors (45483950069).

123111212331 is a wasteful number, since it uses less digits than its factorization.

123111212331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68718.

The product of its digits is 216, while the sum is 21.

Adding to 123111212331 its reverse (133212111321), we get a palindrome (256323323652).

The spelling of 123111212331 in words is "one hundred twenty-three billion, one hundred eleven million, two hundred twelve thousand, three hundred thirty-one".