123221031020 has 12 divisors (see below), whose sum is σ = 258764165184. Its totient is φ = 49288412400.

The previous prime is 123221031007. The next prime is 123221031023. The reversal of 123221031020 is 20130122321.

It is a self number, because there is not a number n which added to its sum of digits gives 123221031020.

It is not an unprimeable number, because it can be changed into a prime (123221031023) 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, 3080525756 + ... + 3080525795.

It is an arithmetic number, because the mean of its divisors is an integer number (21563680432).

Almost surely, 2^123221031020 is an apocalyptic number.

123221031020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123221031020 is an abundant number, since it is smaller than the sum of its proper divisors (135543134164).

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

123221031020 is a wasteful number, since it uses less digits than its factorization.

123221031020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161051560 (or 6161051558 counting only the distinct ones).

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

Adding to 123221031020 its reverse (20130122321), we get a palindrome (143351153341).

The spelling of 123221031020 in words is "one hundred twenty-three billion, two hundred twenty-one million, thirty-one thousand, twenty".