1221200020200 has 96 divisors (see below), whose sum is σ = 3837579379200. Its totient is φ = 321192322560.

The previous prime is 1221200020171. The next prime is 1221200020213. The reversal of 1221200020200 is 20200021221.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13896840 + ... + 13984439.

It is an arithmetic number, because the mean of its divisors is an integer number (39974785200).

Almost surely, 2^{1221200020200} is an apocalyptic number.

1221200020200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221200020200 is an abundant number, since it is smaller than the sum of its proper divisors (2616379359000).

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

1221200020200 is a wasteful number, since it uses less digits than its factorization.

1221200020200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27881371 (or 27881362 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1221200020200 its reverse (20200021221), we get a palindrome (1241400041421).

The spelling of 1221200020200 in words is "one trillion, two hundred twenty-one billion, two hundred million, twenty thousand, two hundred".