221612244 has 48 divisors (see below), whose sum is σ = 592747008. Its totient is φ = 63127008.

The previous prime is 221612227. The next prime is 221612267. The reversal of 221612244 is 442216122.

It is a happy number.

It is a super-2 number, since 2×221612244² = 98223973381431072, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25347 + ... + 32949.

It is an arithmetic number, because the mean of its divisors is an integer number (12348896).

Almost surely, 2^221612244 is an apocalyptic number.

It is an amenable number.

221612244 is an abundant number, since it is smaller than the sum of its proper divisors (371134764).

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

221612244 is a wasteful number, since it uses less digits than its factorization.

221612244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7964 (or 7962 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 221612244 is about 14886.6464994639. The cubic root of 221612244 is about 605.1521544316.

Adding to 221612244 its reverse (442216122), we get a palindrome (663828366).

The spelling of 221612244 in words is "two hundred twenty-one million, six hundred twelve thousand, two hundred forty-four".