1231011321233 has 16 divisors (see below), whose sum is σ = 1275044198400. Its totient is φ = 1187725400400.

The previous prime is 1231011321229. The next prime is 1231011321247. The reversal of 1231011321233 is 3321231101321.

It is not a de Polignac number, because 1231011321233 - 2² = 1231011321229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231011321199 and 1231011321208.

It is not an unprimeable number, because it can be changed into a prime (1231011321283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55713518 + ... + 55735608.

It is an arithmetic number, because the mean of its divisors is an integer number (79690262400).

Almost surely, 2^{1231011321233} is an apocalyptic number.

It is an amenable number.

1231011321233 is a deficient number, since it is larger than the sum of its proper divisors (44032877167).

1231011321233 is a wasteful number, since it uses less digits than its factorization.

1231011321233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38908.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1231011321233 its reverse (3321231101321), we get a palindrome (4552242422554).

The spelling of 1231011321233 in words is "one trillion, two hundred thirty-one billion, eleven million, three hundred twenty-one thousand, two hundred thirty-three".