221122222200 has 288 divisors, whose sum is σ = 825400452240. Its totient is φ = 52593715200.

The previous prime is 221122222193. The next prime is 221122222207. The reversal of 221122222200 is 2222221122.

221122222200 is a `hidden beast` number, since 221 + 1 + 2 + 222 + 220 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (221122222193) and next prime (221122222207).

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

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122222207) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 944044 + ... + 1154756.

Almost surely, 2^221122222200 is an apocalyptic number.

221122222200 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 221122222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412700226120).

221122222200 is an abundant number, since it is smaller than the sum of its proper divisors (604278230040).

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

221122222200 is a wasteful number, since it uses less digits than its factorization.

221122222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210799 (or 210787 counting only the distinct ones).

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

Adding to 221122222200 its reverse (2222221122), we get a palindrome (223344443322).

The spelling of 221122222200 in words is "two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred".