123123221320 has 64 divisors (see below), whose sum is σ = 305327232000. Its totient is φ = 44310497280.

The previous prime is 123123221269. The next prime is 123123221323. The reversal of 123123221320 is 23122321321.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 123123221291 and 123123221300.

It is not an unprimeable number, because it can be changed into a prime (123123221323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1399720 + ... + 1485079.

It is an arithmetic number, because the mean of its divisors is an integer number (4770738000).

Almost surely, 2^123123221320 is an apocalyptic number.

123123221320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123123221320 is an abundant number, since it is smaller than the sum of its proper divisors (182204010680).

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

123123221320 is a wasteful number, since it uses less digits than its factorization.

123123221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884918 (or 2884914 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 123123221320 its reverse (23122321321), we get a palindrome (146245542641).

It can be divided in two parts, 123123 and 221320, that added together give a palindrome (344443).

The spelling of 123123221320 in words is "one hundred twenty-three billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty".