1221202112200 has 48 divisors (see below), whose sum is σ = 3244908473280. Its totient is φ = 418697866560.

The previous prime is 1221202112191. The next prime is 1221202112219. The reversal of 1221202112200 is 22112021221.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 436142212 + ... + 436145011.

It is an arithmetic number, because the mean of its divisors is an integer number (67602259860).

Almost surely, 2^{1221202112200} is an apocalyptic number.

1221202112200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221202112200 is an abundant number, since it is smaller than the sum of its proper divisors (2023706361080).

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

1221202112200 is a wasteful number, since it uses less digits than its factorization.

1221202112200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872287246 (or 872287237 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221202112200 its reverse (22112021221), we get a palindrome (1243314133421).

The spelling of 1221202112200 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred".