22221665 has 8 divisors (see below), whose sum is σ = 26732160. Its totient is φ = 17733232.

The previous prime is 22221649. The next prime is 22221691. The reversal of 22221665 is 56612222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22221665 - 2⁴ = 22221649 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3209 + ... + 7398.

It is an arithmetic number, because the mean of its divisors is an integer number (3341520).

Almost surely, 2^22221665 is an apocalyptic number.

It is an amenable number.

22221665 is a deficient number, since it is larger than the sum of its proper divisors (4510495).

22221665 is a wasteful number, since it uses less digits than its factorization.

22221665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11031.

The product of its digits is 2880, while the sum is 26.

The square root of 22221665 is about 4713.9861051980. The cubic root of 22221665 is about 281.1418718505.

Adding to 22221665 its reverse (56612222), we get a palindrome (78833887).

The spelling of 22221665 in words is "twenty-two million, two hundred twenty-one thousand, six hundred sixty-five".