123221102220 has 144 divisors (see below), whose sum is σ = 384149551968. Its totient is φ = 31947816960.

The previous prime is 123221102197. The next prime is 123221102233. The reversal of 123221102220 is 22201122321.

123221102220 is a `hidden beast` number, since 1 + 232 + 211 + 0 + 2 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123221102193 and 123221102202.

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 47 ways as a sum of consecutive naturals, for example, 10456972 + ... + 10468748.

It is an arithmetic number, because the mean of its divisors is an integer number (2667705222).

Almost surely, 2^123221102220 is an apocalyptic number.

123221102220 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 123221102220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192074775984).

123221102220 is an abundant number, since it is smaller than the sum of its proper divisors (260928449748).

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

123221102220 is a wasteful number, since it uses less digits than its factorization.

123221102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13400 (or 13395 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 123221102220 its reverse (22201122321), we get a palindrome (145422224541).

The spelling of 123221102220 in words is "one hundred twenty-three billion, two hundred twenty-one million, one hundred two thousand, two hundred twenty".