221222636 has 24 divisors (see below), whose sum is σ = 395508960. Its totient is φ = 108231552.

The previous prime is 221222633. The next prime is 221222647. The reversal of 221222636 is 636222122.

It is not an unprimeable number, because it can be changed into a prime (221222633) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 91880 + ... + 94256.

It is an arithmetic number, because the mean of its divisors is an integer number (16479540).

Almost surely, 2^221222636 is an apocalyptic number.

It is an amenable number.

221222636 is a deficient number, since it is larger than the sum of its proper divisors (174286324).

221222636 is a wasteful number, since it uses less digits than its factorization.

221222636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873 (or 2871 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 221222636 is about 14873.5549214033. The cubic root of 221222636 is about 604.7973147971.

Adding to 221222636 its reverse (636222122), we get a palindrome (857444758).

The spelling of 221222636 in words is "two hundred twenty-one million, two hundred twenty-two thousand, six hundred thirty-six".