121221000022200 has 144 divisors (see below), whose sum is σ = 406915227042120. Its totient is φ = 29839015365120.

The previous prime is 121221000022189. The next prime is 121221000022223. The reversal of 121221000022200 is 2220000122121.

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 121221000022200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 597635287 + ... + 597838086.

Almost surely, 2^{121221000022200} is an apocalyptic number.

121221000022200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221000022200 is an abundant number, since it is smaller than the sum of its proper divisors (285694227019920).

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

121221000022200 is a wasteful number, since it uses less digits than its factorization.

121221000022200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195473418 (or 1195473396 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 121221000022200 its reverse (2220000122121), we get a palindrome (123441000144321).

The spelling of 121221000022200 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-two thousand, two hundred".