1220121120200 has 96 divisors (see below), whose sum is σ = 3004507420200. Its totient is φ = 459208765440.

The previous prime is 1220121120191. The next prime is 1220121120223. The reversal of 1220121120200 is 20211210221.

It can be written as a sum of positive squares in 12 ways, for example, as 63605848804 + 1156515271396 = 252202^2 + 1075414^2 .

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, 12316466 + ... + 12415134.

Almost surely, 2^{1220121120200} is an apocalyptic number.

1220121120200 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 1220121120200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502253710100).

1220121120200 is an abundant number, since it is smaller than the sum of its proper divisors (1784386300000).

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

1220121120200 is a wasteful number, since it uses less digits than its factorization.

1220121120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102339 (or 102330 counting only the distinct ones).

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

Adding to 1220121120200 its reverse (20211210221), we get a palindrome (1240332330421).

The spelling of 1220121120200 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty thousand, two hundred".