22566213 has 12 divisors (see below), whose sum is σ = 32885580. Its totient is φ = 14910336.

The previous prime is 22566163. The next prime is 22566221. The reversal of 22566213 is 31266522.

It can be written as a sum of positive squares in 2 ways, for example, as 6066369 + 16499844 = 2463^2 + 4062^2 .

It is not a de Polignac number, because 22566213 - 2⁶ = 22566149 is a prime.

It is a super-2 number, since 2×22566213² = 1018467938322738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22566223) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 10078 + ... + 12111.

It is an arithmetic number, because the mean of its divisors is an integer number (2740465).

Almost surely, 2^22566213 is an apocalyptic number.

It is an amenable number.

22566213 is a deficient number, since it is larger than the sum of its proper divisors (10319367).

22566213 is a wasteful number, since it uses less digits than its factorization.

22566213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22308 (or 22305 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 22566213 is about 4750.3908260268. The cubic root of 22566213 is about 282.5874655421.

The spelling of 22566213 in words is "twenty-two million, five hundred sixty-six thousand, two hundred thirteen".