221115222 has 24 divisors (see below), whose sum is σ = 479416080. Its totient is φ = 73653840.

The previous prime is 221115151. The next prime is 221115241. The reversal of 221115222 is 222511122.

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

It is a junction number, because it is equal to n+sod(n) for n = 221115195 and 221115204.

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 11 ways as a sum of consecutive naturals, for example, 29604 + ... + 36312.

It is an arithmetic number, because the mean of its divisors is an integer number (19975670).

Almost surely, 2^221115222 is an apocalyptic number.

221115222 is an abundant number, since it is smaller than the sum of its proper divisors (258300858).

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

221115222 is a wasteful number, since it uses less digits than its factorization.

221115222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8548 (or 8545 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 221115222 is about 14869.9435775661. The cubic root of 221115222 is about 604.6994130978.

Adding to 221115222 its reverse (222511122), we get a palindrome (443626344).

The spelling of 221115222 in words is "two hundred twenty-one million, one hundred fifteen thousand, two hundred twenty-two".