1222121221200 has 1440 divisors, whose sum is σ = 5102689692672. Its totient is φ = 267411456000.

The previous prime is 1222121221199. The next prime is 1222121221267. The reversal of 1222121221200 is 21221212221.

It is a happy number.

1222121221200 is a `hidden beast` number, since 1 + 2 + 221 + 21 + 221 + 200 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 287 ways as a sum of consecutive naturals, for example, 3276464214 + ... + 3276464586.

Almost surely, 2^{1222121221200} is an apocalyptic number.

1222121221200 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 1222121221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2551344846336).

1222121221200 is an abundant number, since it is smaller than the sum of its proper divisors (3880568471472).

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

1222121221200 is a wasteful number, since it uses less digits than its factorization.

1222121221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1222121221200 its reverse (21221212221), we get a palindrome (1243342433421).

The spelling of 1222121221200 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred".