1211102221200 has 60 divisors (see below), whose sum is σ = 3879564119088. Its totient is φ = 322960592000.

The previous prime is 1211102221187. The next prime is 1211102221213. The reversal of 1211102221200 is 21222011121.

It is an interprime number because it is at equal distance from previous prime (1211102221187) and next prime (1211102221213).

It is a tau number, because it is divible by the number of its divisors (60).

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 1211102221200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504624726 + ... + 504627125.

Almost surely, 2^{1211102221200} is an apocalyptic number.

1211102221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211102221200 is an abundant number, since it is smaller than the sum of its proper divisors (2668461897888).

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

1211102221200 is a wasteful number, since it uses less digits than its factorization.

1211102221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009251872 (or 1009251861 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211102221200 its reverse (21222011121), we get a palindrome (1232324232321).

The spelling of 1211102221200 in words is "one trillion, two hundred eleven billion, one hundred two million, two hundred twenty-one thousand, two hundred".