123231113221 has 4 divisors (see below), whose sum is σ = 130480002252. Its totient is φ = 115982224192.

The previous prime is 123231113191. The next prime is 123231113233. The reversal of 123231113221 is 122311132321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48217572225 + 75013540996 = 219585^2 + 273886^2 .

It is not a de Polignac number, because 123231113221 - 2¹⁹ = 123230588933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123231113192 and 123231113201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123231113281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3624444490 + ... + 3624444523.

It is an arithmetic number, because the mean of its divisors is an integer number (32620000563).

Almost surely, 2^123231113221 is an apocalyptic number.

It is an amenable number.

123231113221 is a deficient number, since it is larger than the sum of its proper divisors (7248889031).

123231113221 is an equidigital number, since it uses as much as digits as its factorization.

123231113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7248889030.

The product of its digits is 432, while the sum is 22.

Adding to 123231113221 its reverse (122311132321), we get a palindrome (245542245542).

The spelling of 123231113221 in words is "one hundred twenty-three billion, two hundred thirty-one million, one hundred thirteen thousand, two hundred twenty-one".