2221212211200 has 432 divisors, whose sum is σ = 7983511131960. Its totient is φ = 590195589120.

The previous prime is 2221212211199. The next prime is 2221212211213. The reversal of 2221212211200 is 21122121222.

It is a happy number.

2221212211200 is a `hidden beast` number, since 2 + 221 + 21 + 221 + 1 + 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 (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 130397884 + ... + 130414916.

Almost surely, 2^{2221212211200} is an apocalyptic number.

2221212211200 is a gapful number since it is divisible by the number (20) 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 2221212211200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3991755565980).

2221212211200 is an abundant number, since it is smaller than the sum of its proper divisors (5762298920760).

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

2221212211200 is a wasteful number, since it uses less digits than its factorization.

2221212211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17354 (or 17326 counting only the distinct ones).

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

Adding to 2221212211200 its reverse (21122121222), we get a palindrome (2242334332422).

The spelling of 2221212211200 in words is "two trillion, two hundred twenty-one billion, two hundred twelve million, two hundred eleven thousand, two hundred".