1221201100200 has 48 divisors (see below), whose sum is σ = 3785723412480. Its totient is φ = 325653626560.

The previous prime is 1221201100139. The next prime is 1221201100237. The reversal of 1221201100200 is 20011021221.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 1017666984 + ... + 1017668183.

It is an arithmetic number, because the mean of its divisors is an integer number (78869237760).

Almost surely, 2^{1221201100200} is an apocalyptic number.

1221201100200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221201100200 is an abundant number, since it is smaller than the sum of its proper divisors (2564522312280).

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

1221201100200 is a wasteful number, since it uses less digits than its factorization.

1221201100200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035335186 (or 2035335177 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221201100200 its reverse (20011021221), we get a palindrome (1241212121421).

The spelling of 1221201100200 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred thousand, two hundred".