1221222122200 has 48 divisors (see below), whose sum is σ = 2849445983160. Its totient is φ = 486750432000.

The previous prime is 1221222122177. The next prime is 1221222122209. The reversal of 1221222122200 is 22212221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222122209) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 10808766 + ... + 10921165.

Almost surely, 2^{1221222122200} is an apocalyptic number.

1221222122200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221222122200 is an abundant number, since it is smaller than the sum of its proper divisors (1628223860960).

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

1221222122200 is a wasteful number, since it uses less digits than its factorization.

1221222122200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21730228 (or 21730219 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1221222122200 its reverse (22212221221), we get a palindrome (1243434343421).

It can be divided in two parts, 12 and 21222122200, that added together give a palindrome (21222122212).

The spelling of 1221222122200 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred".