1221120222200 has 24 divisors (see below), whose sum is σ = 2839104517080. Its totient is φ = 488448088800.

The previous prime is 1221120222149. The next prime is 1221120222209. The reversal of 1221120222200 is 22220211221.

It is a happy number.

It is a super-2 number, since 2×1221120222200² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120222209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3052800356 + ... + 3052800755.

It is an arithmetic number, because the mean of its divisors is an integer number (118296021545).

Almost surely, 2^{1221120222200} is an apocalyptic number.

1221120222200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221120222200 is an abundant number, since it is smaller than the sum of its proper divisors (1617984294880).

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

1221120222200 is a wasteful number, since it uses less digits than its factorization.

1221120222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6105601127 (or 6105601118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221120222200 its reverse (22220211221), we get a palindrome (1243340433421).

The spelling of 1221120222200 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, two hundred".