123320991220 has 24 divisors (see below), whose sum is σ = 295970379264. Its totient is φ = 42281482656.

The previous prime is 123320991149. The next prime is 123320991251. The reversal of 123320991220 is 22199023321.

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, 440431972 + ... + 440432251.

It is an arithmetic number, because the mean of its divisors is an integer number (12332099136).

Almost surely, 2^123320991220 is an apocalyptic number.

123320991220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123320991220 is an abundant number, since it is smaller than the sum of its proper divisors (172649388044).

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

123320991220 is a wasteful number, since it uses less digits than its factorization.

123320991220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880864239 (or 880864237 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 123320991220 in words is "one hundred twenty-three billion, three hundred twenty million, nine hundred ninety-one thousand, two hundred twenty".