1231221123 has 24 divisors (see below), whose sum is σ = 1944072000. Its totient is φ = 744669360.

The previous prime is 1231221113. The next prime is 1231221137. The reversal of 1231221123 is 3211221321.

It is not a de Polignac number, because 1231221123 - 2⁵ = 1231221091 is a prime.

It is a super-2 number, since 2×1231221123² = 3031810907442762258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231221096 and 1231221105.

It is not an unprimeable number, because it can be changed into a prime (1231221113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36940 + ... + 61862.

It is an arithmetic number, because the mean of its divisors is an integer number (81003000).

Almost surely, 2^1231221123 is an apocalyptic number.

1231221123 is a deficient number, since it is larger than the sum of its proper divisors (712850877).

1231221123 is a wasteful number, since it uses less digits than its factorization.

1231221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25439 (or 25436 counting only the distinct ones).

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

The square root of 1231221123 is about 35088.7606364203. The cubic root of 1231221123 is about 1071.7957219518.

Adding to 1231221123 its reverse (3211221321), we get a palindrome (4442442444).

The spelling of 1231221123 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, one hundred twenty-three".