123031021220 has 96 divisors (see below), whose sum is σ = 273175203840. Its totient is φ = 46470775680.

The previous prime is 123031021151. The next prime is 123031021237. The reversal of 123031021220 is 22120130321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38895359 + ... + 38898521.

It is an arithmetic number, because the mean of its divisors is an integer number (2845575040).

Almost surely, 2^123031021220 is an apocalyptic number.

123031021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123031021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136587601920).

123031021220 is an abundant number, since it is smaller than the sum of its proper divisors (150144182620).

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

123031021220 is a wasteful number, since it uses less digits than its factorization.

123031021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4705 (or 4703 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 123031021220 its reverse (22120130321), we get a palindrome (145151151541).

The spelling of 123031021220 in words is "one hundred twenty-three billion, thirty-one million, twenty-one thousand, two hundred twenty".