121222100200 has 24 divisors (see below), whose sum is σ = 281841383430. Its totient is φ = 48488840000.

The previous prime is 121222100191. The next prime is 121222100221. The reversal of 121222100200 is 2001222121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 116866892164 + 4355208036 = 341858^2 + 65994^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 303055051 + ... + 303055450.

Almost surely, 2^121222100200 is an apocalyptic number.

121222100200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222100200 is an abundant number, since it is smaller than the sum of its proper divisors (160619283230).

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

121222100200 is a wasteful number, since it uses less digits than its factorization.

121222100200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606110517 (or 606110508 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121222100200 its reverse (2001222121), we get a palindrome (123223322321).

The spelling of 121222100200 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred".