123220443320 has 128 divisors (see below), whose sum is σ = 306805847040. Its totient is φ = 44254149120.

The previous prime is 123220443319. The next prime is 123220443323. The reversal of 123220443320 is 23344022321.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 123220443320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123220443323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3968255 + ... + 3999185.

It is an arithmetic number, because the mean of its divisors is an integer number (2396920680).

Almost surely, 2^123220443320 is an apocalyptic number.

123220443320 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 123220443320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153402923520).

123220443320 is an abundant number, since it is smaller than the sum of its proper divisors (183585403720).

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

123220443320 is a wasteful number, since it uses less digits than its factorization.

123220443320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31165 (or 31161 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 123220443320 its reverse (23344022321), we get a palindrome (146564465641).

The spelling of 123220443320 in words is "one hundred twenty-three billion, two hundred twenty million, four hundred forty-three thousand, three hundred twenty".