221425244 has 12 divisors (see below), whose sum is σ = 387601368. Its totient is φ = 110682000.

The previous prime is 221425241. The next prime is 221425249. The reversal of 221425244 is 442524122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221425241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18674 + ... + 28134.

It is an arithmetic number, because the mean of its divisors is an integer number (32300114).

Almost surely, 2^221425244 is an apocalyptic number.

It is an amenable number.

221425244 is a deficient number, since it is larger than the sum of its proper divisors (166176124).

221425244 is a wasteful number, since it uses less digits than its factorization.

221425244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15316 (or 15314 counting only the distinct ones).

The product of its digits is 5120, while the sum is 26.

The square root of 221425244 is about 14880.3643772590. The cubic root of 221425244 is about 604.9818941375.

Adding to 221425244 its reverse (442524122), we get a palindrome (663949366).

The spelling of 221425244 in words is "two hundred twenty-one million, four hundred twenty-five thousand, two hundred forty-four".