221220022200 has 48 divisors (see below), whose sum is σ = 685782070680. Its totient is φ = 58992005760.

The previous prime is 221220022181. The next prime is 221220022213. The reversal of 221220022200 is 2220022122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221220022200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184349419 + ... + 184350618.

Almost surely, 2^221220022200 is an apocalyptic number.

221220022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220022200 is an abundant number, since it is smaller than the sum of its proper divisors (464562048480).

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

221220022200 is a wasteful number, since it uses less digits than its factorization.

221220022200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368700056 (or 368700047 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 221220022200 its reverse (2220022122), we get a palindrome (223440044322).

The spelling of 221220022200 in words is "two hundred twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred".