123221121320 has 32 divisors (see below), whose sum is σ = 302451844320. Its totient is φ = 44807680320.

The previous prime is 123221121299. The next prime is 123221121337. The reversal of 123221121320 is 23121122321.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 123221121292 and 123221121301.

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, 140023562 + ... + 140024441.

It is an arithmetic number, because the mean of its divisors is an integer number (9451620135).

Almost surely, 2^123221121320 is an apocalyptic number.

123221121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123221121320 is an abundant number, since it is smaller than the sum of its proper divisors (179230723000).

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

123221121320 is a wasteful number, since it uses less digits than its factorization.

123221121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280048025 (or 280048021 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 123221121320 its reverse (23121122321), we get a palindrome (146342243641).

The spelling of 123221121320 in words is "one hundred twenty-three billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred twenty".