123120031221 has 48 divisors (see below), whose sum is σ = 198001806912. Its totient is φ = 73086624000.

The previous prime is 123120031211. The next prime is 123120031249. The reversal of 123120031221 is 122130021321.

It is not a de Polignac number, because 123120031221 - 2¹¹ = 123120029173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123120031194 and 123120031203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123120031211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3133926 + ... + 3172968.

It is an arithmetic number, because the mean of its divisors is an integer number (4125037644).

Almost surely, 2^123120031221 is an apocalyptic number.

123120031221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123120031221 is a deficient number, since it is larger than the sum of its proper divisors (74881775691).

123120031221 is a wasteful number, since it uses less digits than its factorization.

123120031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39714 (or 39711 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 123120031221 its reverse (122130021321), we get a palindrome (245250052542).

The spelling of 123120031221 in words is "one hundred twenty-three billion, one hundred twenty million, thirty-one thousand, two hundred twenty-one".