121012321200 has 120 divisors (see below), whose sum is σ = 388053229968. Its totient is φ = 32235786240.

The previous prime is 121012321181. The next prime is 121012321207. The reversal of 121012321200 is 2123210121.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a self number, because there is not a number n which added to its sum of digits gives 121012321200.

It is not an unprimeable number, because it can be changed into a prime (121012321207) 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, 1090692 + ... + 1196508.

Almost surely, 2^121012321200 is an apocalyptic number.

121012321200 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 121012321200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194026614984).

121012321200 is an abundant number, since it is smaller than the sum of its proper divisors (267040908768).

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

121012321200 is a wasteful number, since it uses less digits than its factorization.

121012321200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106791 (or 106780 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121012321200 its reverse (2123210121), we get a palindrome (123135531321).

The spelling of 121012321200 in words is "one hundred twenty-one billion, twelve million, three hundred twenty-one thousand, two hundred".