22666321 has 4 divisors (see below), whose sum is σ = 23999652. Its totient is φ = 21332992.

The previous prime is 22666309. The next prime is 22666333. The reversal of 22666321 is 12366622.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (22666309) and next prime (22666333).

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 12680721 = 3160^2 + 3561^2 .

It is a cyclic number.

It is not a de Polignac number, because 22666321 - 2¹¹ = 22664273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22666321.

It is not an unprimeable number, because it can be changed into a prime (22666381) 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 3 ways as a sum of consecutive naturals, for example, 666640 + ... + 666673.

It is an arithmetic number, because the mean of its divisors is an integer number (5999913).

Almost surely, 2^22666321 is an apocalyptic number.

It is an amenable number.

22666321 is a deficient number, since it is larger than the sum of its proper divisors (1333331).

22666321 is a wasteful number, since it uses less digits than its factorization.

22666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333330.

The product of its digits is 5184, while the sum is 28.

The square root of 22666321 is about 4760.9159832957. The cubic root of 22666321 is about 283.0047196706.

The spelling of 22666321 in words is "twenty-two million, six hundred sixty-six thousand, three hundred twenty-one".