222221221200 has 720 divisors, whose sum is σ = 877460654400. Its totient is φ = 52970112000.

The previous prime is 222221221139. The next prime is 222221221219. The reversal of 222221221200 is 2122122222.

222221221200 is a `hidden beast` number, since 2 + 22 + 221 + 221 + 200 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

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 polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1696345135 + ... + 1696345265.

Almost surely, 2^222221221200 is an apocalyptic number.

222221221200 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 222221221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438730327200).

222221221200 is an abundant number, since it is smaller than the sum of its proper divisors (655239433200).

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

222221221200 is a wasteful number, since it uses less digits than its factorization.

222221221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 222221221200 its reverse (2122122222), we get a palindrome (224343343422).

It can be divided in two parts, 22 and 2221221200, that added together give a palindrome (2221221222).

The spelling of 222221221200 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred".