123121123120 has 40 divisors (see below), whose sum is σ = 287024124816. Its totient is φ = 49116403968.

The previous prime is 123121123079. The next prime is 123121123129. The reversal of 123121123120 is 21321121321.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (123121123129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2033182 + ... + 2092861.

Almost surely, 2^123121123120 is an apocalyptic number.

123121123120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121123120 is an abundant number, since it is smaller than the sum of its proper divisors (163903001696).

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

123121123120 is a wasteful number, since it uses less digits than its factorization.

123121123120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126429 (or 4126423 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 123121123120 its reverse (21321121321), we get a palindrome (144442244441).

The spelling of 123121123120 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty".