123121321002120 has 128 divisors (see below), whose sum is σ = 423687920394240. Its totient is φ = 28038171098880.

The previous prime is 123121321002089. The next prime is 123121321002139. The reversal of 123121321002120 is 21200123121321.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 270202252 + ... + 270657531.

It is an arithmetic number, because the mean of its divisors is an integer number (3310061878080).

Almost surely, 2^{123121321002120} is an apocalyptic number.

123121321002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121321002120 is an abundant number, since it is smaller than the sum of its proper divisors (300566599392120).

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

123121321002120 is a wasteful number, since it uses less digits than its factorization.

123121321002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540860075 (or 540860071 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 123121321002120 its reverse (21200123121321), we get a palindrome (144321444123441).

The spelling of 123121321002120 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, three hundred twenty-one million, two thousand, one hundred twenty".