123121320320 has 64 divisors (see below), whose sum is σ = 300599467200. Its totient is φ = 48200675328.

The previous prime is 123121320299. The next prime is 123121320341. The reversal of 123121320320 is 23023121321.

It is an interprime number because it is at equal distance from previous prime (123121320299) and next prime (123121320341).

It is a tau number, because it is divible by the number of its divisors (64).

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 = 123121320292 and 123121320301.

It is a congruent number.

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, 2016485 + ... + 2076644.

It is an arithmetic number, because the mean of its divisors is an integer number (4696866675).

Almost surely, 2^123121320320 is an apocalyptic number.

123121320320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121320320 is an abundant number, since it is smaller than the sum of its proper divisors (177478146880).

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

123121320320 is an equidigital number, since it uses as much as digits as its factorization.

123121320320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4093195 (or 4093183 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123121320320 its reverse (23023121321), we get a palindrome (146144441641).

The spelling of 123121320320 in words is "one hundred twenty-three billion, one hundred twenty-one million, three hundred twenty thousand, three hundred twenty".