1221102200200 has 96 divisors (see below), whose sum is σ = 2880337912200. Its totient is φ = 481350850560.

The previous prime is 1221102200189. The next prime is 1221102200221. The reversal of 1221102200200 is 20022011221.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 240800229796 + 980301970404 = 490714^2 + 990102^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17909374 + ... + 17977426.

Almost surely, 2^{1221102200200} is an apocalyptic number.

1221102200200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221102200200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440168956100).

1221102200200 is an abundant number, since it is smaller than the sum of its proper divisors (1659235712000).

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

1221102200200 is a wasteful number, since it uses less digits than its factorization.

1221102200200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69371 (or 69362 counting only the distinct ones).

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

Adding to 1221102200200 its reverse (20022011221), we get a palindrome (1241124211421).

The spelling of 1221102200200 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred thousand, two hundred".