12123100031 has 4 divisors (see below), whose sum is σ = 13854971472. Its totient is φ = 10391228592.

The previous prime is 12123100021. The next prime is 12123100039. The reversal of 12123100031 is 13000132121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13000132121 = 113 ⋅115045417.

It is a cyclic number.

It is not a de Polignac number, because 12123100031 - 2³⁰ = 11049358207 is a prime.

It is a super-2 number, since 2×12123100031² (a number of 21 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 = 12123099979 and 12123100015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123100039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865935710 + ... + 865935723.

It is an arithmetic number, because the mean of its divisors is an integer number (3463742868).

Almost surely, 2^12123100031 is an apocalyptic number.

12123100031 is a deficient number, since it is larger than the sum of its proper divisors (1731871441).

12123100031 is an equidigital number, since it uses as much as digits as its factorization.

12123100031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731871440.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 12123100031 its reverse (13000132121), we get a palindrome (25123232152).

The spelling of 12123100031 in words is "twelve billion, one hundred twenty-three million, one hundred thousand, thirty-one".