121320031200 has 144 divisors (see below), whose sum is σ = 415680894720. Its totient is φ = 30649259520.

The previous prime is 121320031193. The next prime is 121320031213. The reversal of 121320031200 is 2130023121.

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

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 121320031200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1284664 + ... + 1375863.

It is an arithmetic number, because the mean of its divisors is an integer number (2886672880).

Almost surely, 2^121320031200 is an apocalyptic number.

121320031200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121320031200 is an abundant number, since it is smaller than the sum of its proper divisors (294360863520).

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

121320031200 is a wasteful number, since it uses less digits than its factorization.

121320031200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660569 (or 2660556 counting only the distinct ones).

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

Adding to 121320031200 its reverse (2130023121), we get a palindrome (123450054321).

The spelling of 121320031200 in words is "one hundred twenty-one billion, three hundred twenty million, thirty-one thousand, two hundred".