22221647 has 12 divisors (see below), whose sum is σ = 26402400. Its totient is φ = 18639936.

The previous prime is 22221599. The next prime is 22221649. The reversal of 22221647 is 74612222.

It is not a de Polignac number, because 22221647 - 2⁸ = 22221391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221649) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2522 + ... + 7127.

It is an arithmetic number, because the mean of its divisors is an integer number (2200200).

Almost surely, 2^22221647 is an apocalyptic number.

22221647 is a deficient number, since it is larger than the sum of its proper divisors (4180753).

22221647 is an equidigital number, since it uses as much as digits as its factorization.

22221647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9710 (or 9703 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 22221647 is about 4713.9841959854. The cubic root of 22221647 is about 281.1417959403.

Adding to 22221647 its reverse (74612222), we get a palindrome (96833869).

The spelling of 22221647 in words is "twenty-two million, two hundred twenty-one thousand, six hundred forty-seven".