123231111220 has 24 divisors (see below), whose sum is σ = 295754667264. Its totient is φ = 42250666656.

The previous prime is 123231111209. The next prime is 123231111281. The reversal of 123231111220 is 22111132321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440110972 + ... + 440111251.

It is an arithmetic number, because the mean of its divisors is an integer number (12323111136).

Almost surely, 2^123231111220 is an apocalyptic number.

123231111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123231111220 is an abundant number, since it is smaller than the sum of its proper divisors (172523556044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123231111220 is a wasteful number, since it uses less digits than its factorization.

123231111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880222239 (or 880222237 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 123231111220 its reverse (22111132321), we get a palindrome (145342243541).

The spelling of 123231111220 in words is "one hundred twenty-three billion, two hundred thirty-one million, one hundred eleven thousand, two hundred twenty".