121321320000 has 560 divisors, whose sum is σ = 423345985920. Its totient is φ = 30593024000.

The previous prime is 121321319983. The next prime is 121321320013. The reversal of 121321320000 is 23123121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 311879806 + ... + 311880194.

Almost surely, 2^121321320000 is an apocalyptic number.

121321320000 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 121321320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211672992960).

121321320000 is an abundant number, since it is smaller than the sum of its proper divisors (302024665920).

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

121321320000 is a wasteful number, since it uses less digits than its factorization.

121321320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 121321320000 its reverse (23123121), we get a palindrome (121344443121).

The spelling of 121321320000 in words is "one hundred twenty-one billion, three hundred twenty-one million, three hundred twenty thousand".