1221101220200 has 96 divisors (see below), whose sum is σ = 2969890004160. Its totient is φ = 466038144000.

The previous prime is 1221101220179. The next prime is 1221101220221. The reversal of 1221101220200 is 20221011221.

It is an interprime number because it is at equal distance from previous prime (1221101220179) and next prime (1221101220221).

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, 1513607 + ... + 2175593.

It is an arithmetic number, because the mean of its divisors is an integer number (30936354210).

Almost surely, 2^{1221101220200} is an apocalyptic number.

1221101220200 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 1221101220200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1484945002080).

1221101220200 is an abundant number, since it is smaller than the sum of its proper divisors (1748788783960).

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

1221101220200 is a wasteful number, since it uses less digits than its factorization.

1221101220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662427 (or 662418 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221101220200 its reverse (20221011221), we get a palindrome (1241322231421).

The spelling of 1221101220200 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, two hundred".