123113321220 has 72 divisors (see below), whose sum is σ = 354286021824. Its totient is φ = 31942894464.

The previous prime is 123113321213. The next prime is 123113321237. The reversal of 123113321220 is 22123311321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 667272 + ... + 831551.

It is an arithmetic number, because the mean of its divisors is an integer number (4920639192).

Almost surely, 2^123113321220 is an apocalyptic number.

123113321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123113321220 is an abundant number, since it is smaller than the sum of its proper divisors (231172700604).

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

123113321220 is a wasteful number, since it uses less digits than its factorization.

123113321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498909 (or 1498870 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 123113321220 its reverse (22123311321), we get a palindrome (145236632541).

The spelling of 123113321220 in words is "one hundred twenty-three billion, one hundred thirteen million, three hundred twenty-one thousand, two hundred twenty".