121310123 has 12 divisors (see below), whose sum is σ = 133872480. Its totient is φ = 109842480.

The previous prime is 121310107. The next prime is 121310141. The reversal of 121310123 is 321013121.

It is not a de Polignac number, because 121310123 - 2⁴ = 121310107 is a prime.

It is a super-2 number, since 2×121310123² = 29432291884550258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121310098 and 121310107.

It is not an unprimeable number, because it can be changed into a prime (121310723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30686 + ... + 34412.

It is an arithmetic number, because the mean of its divisors is an integer number (11156040).

Almost surely, 2^121310123 is an apocalyptic number.

121310123 is a deficient number, since it is larger than the sum of its proper divisors (12562357).

121310123 is a wasteful number, since it uses less digits than its factorization.

121310123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018 (or 4007 counting only the distinct ones).

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

The square root of 121310123 is about 11014.0874792241. The cubic root of 121310123 is about 495.0309445675.

Adding to 121310123 its reverse (321013121), we get a palindrome (442323244).

The spelling of 121310123 in words is "one hundred twenty-one million, three hundred ten thousand, one hundred twenty-three".