2121013031123 has 16 divisors (see below), whose sum is σ = 2618983684800. Its totient is φ = 1711069331328.

The previous prime is 2121013031113. The next prime is 2121013031197. The reversal of 2121013031123 is 3211303101212.

It is a happy number.

It is not a de Polignac number, because 2121013031123 - 2²⁰ = 2121011982547 is a prime.

It is a super-2 number, since 2×2121013031123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121013031095 and 2121013031104.

It is not an unprimeable number, because it can be changed into a prime (2121013031113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181868036 + ... + 181879697.

It is an arithmetic number, because the mean of its divisors is an integer number (163686480300).

Almost surely, 2^{2121013031123} is an apocalyptic number.

2121013031123 is a deficient number, since it is larger than the sum of its proper divisors (497970653677).

2121013031123 is an equidigital number, since it uses as much as digits as its factorization.

2121013031123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363747771 (or 363747757 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 2121013031123 its reverse (3211303101212), we get a palindrome (5332316132335).

The spelling of 2121013031123 in words is "two trillion, one hundred twenty-one billion, thirteen million, thirty-one thousand, one hundred twenty-three".