121321123120 has 80 divisors (see below), whose sum is σ = 294604090560. Its totient is φ = 46376174592.

The previous prime is 121321123117. The next prime is 121321123129. The reversal of 121321123120 is 21321123121.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (121321123129) 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, 2025766 + ... + 2084794.

It is an arithmetic number, because the mean of its divisors is an integer number (3682551132).

Almost surely, 2^121321123120 is an apocalyptic number.

121321123120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121321123120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147302045280).

121321123120 is an abundant number, since it is smaller than the sum of its proper divisors (173282967440).

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

121321123120 is a wasteful number, since it uses less digits than its factorization.

121321123120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60182 (or 60176 counting only the distinct ones).

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

Adding to 121321123120 its reverse (21321123121), we get a palindrome (142642246241).

Subtracting from 121321123120 its reverse (21321123121), we obtain a palindrome (99999999999).

The spelling of 121321123120 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty".