121312221200 has 120 divisors (see below), whose sum is σ = 305261265600. Its totient is φ = 46241620480.

The previous prime is 121312221181. The next prime is 121312221203. The reversal of 121312221200 is 2122213121.

It is not an unprimeable number, because it can be changed into a prime (121312221203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2450291 + ... + 2499309.

It is an arithmetic number, because the mean of its divisors is an integer number (2543843880).

Almost surely, 2^121312221200 is an apocalyptic number.

121312221200 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 121312221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152630632800).

121312221200 is an abundant number, since it is smaller than the sum of its proper divisors (183949044400).

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

121312221200 is a wasteful number, since it uses less digits than its factorization.

121312221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49329 (or 49318 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121312221200 its reverse (2122213121), we get a palindrome (123434434321).

The spelling of 121312221200 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred twenty-one thousand, two hundred".