121221101200 has 30 divisors (see below), whose sum is σ = 291233696594. Its totient is φ = 48488440320.

The previous prime is 121221101179. The next prime is 121221101207. The reversal of 121221101200 is 2101122121.

It can be written as a sum of positive squares in 3 ways, for example, as 14315643904 + 106905457296 = 119648^2 + 326964^2 .

It is a super-2 number, since 2×121221101200² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121221101207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151525977 + ... + 151526776.

Almost surely, 2^121221101200 is an apocalyptic number.

121221101200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221101200 is an abundant number, since it is smaller than the sum of its proper divisors (170012595394).

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

121221101200 is a wasteful number, since it uses less digits than its factorization.

121221101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303052771 (or 303052760 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121221101200 its reverse (2101122121), we get a palindrome (123322223321).

The spelling of 121221101200 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, two hundred".