123131112120 has 64 divisors (see below), whose sum is σ = 410437044000. Its totient is φ = 32834962944.

The previous prime is 123131112107. The next prime is 123131112133. The reversal of 123131112120 is 21211131321.

123131112120 is a `hidden beast` number, since 1 + 231 + 311 + 1 + 2 + 120 = 666.

It is an interprime number because it is at equal distance from previous prime (123131112107) and next prime (123131112133).

It is a super-2 number, since 2×123131112120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123131112093 and 123131112102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57004065 + ... + 57006224.

Almost surely, 2^123131112120 is an apocalyptic number.

123131112120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123131112120 is an abundant number, since it is smaller than the sum of its proper divisors (287305931880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123131112120 is a wasteful number, since it uses less digits than its factorization.

123131112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114010309 (or 114010299 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 123131112120 its reverse (21211131321), we get a palindrome (144342243441).

The spelling of 123131112120 in words is "one hundred twenty-three billion, one hundred thirty-one million, one hundred twelve thousand, one hundred twenty".