1221211202200 has 96 divisors (see below), whose sum is σ = 3260458728000. Its totient is φ = 420704323200.

The previous prime is 1221211202191. The next prime is 1221211202201. The reversal of 1221211202200 is 22021121221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211202201) 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, 14565990 + ... + 14649589.

It is an arithmetic number, because the mean of its divisors is an integer number (33963111750).

Almost surely, 2^{1221211202200} is an apocalyptic number.

1221211202200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221211202200 is an abundant number, since it is smaller than the sum of its proper divisors (2039247525800).

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

1221211202200 is a wasteful number, since it uses less digits than its factorization.

1221211202200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29215625 (or 29215616 counting only the distinct ones).

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

Adding to 1221211202200 its reverse (22021121221), we get a palindrome (1243232323421).

The spelling of 1221211202200 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, two hundred".