1231220331123 has 16 divisors (see below), whose sum is σ = 1698335788800. Its totient is φ = 792462575520.

The previous prime is 1231220331091. The next prime is 1231220331127. The reversal of 1231220331123 is 3211330221321.

It is not a de Polignac number, because 1231220331123 - 2⁵ = 1231220331091 is a prime.

It is a super-2 number, since 2×1231220331123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231220331093 and 1231220331102.

It is not an unprimeable number, because it can be changed into a prime (1231220331127) 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, 1084008 + ... + 1907226.

It is an arithmetic number, because the mean of its divisors is an integer number (106145986800).

Almost surely, 2^{1231220331123} is an apocalyptic number.

1231220331123 is a deficient number, since it is larger than the sum of its proper divisors (467115457677).

1231220331123 is a wasteful number, since it uses less digits than its factorization.

1231220331123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840442.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1231220331123 its reverse (3211330221321), we get a palindrome (4442550552444).

The spelling of 1231220331123 in words is "one trillion, two hundred thirty-one billion, two hundred twenty million, three hundred thirty-one thousand, one hundred twenty-three".