22166213 has 4 divisors (see below), whose sum is σ = 22497120. Its totient is φ = 21835308.

The previous prime is 22166201. The next prime is 22166233. The reversal of 22166213 is 31266122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31266122 = 2 ⋅15633061.

It is a cyclic number.

It is not a de Polignac number, because 22166213 - 2⁴ = 22166197 is a prime.

It is a super-2 number, since 2×22166213² = 982681997522738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22166233) 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, 165353 + ... + 165486.

It is an arithmetic number, because the mean of its divisors is an integer number (5624280).

Almost surely, 2^22166213 is an apocalyptic number.

It is an amenable number.

22166213 is a deficient number, since it is larger than the sum of its proper divisors (330907).

22166213 is an equidigital number, since it uses as much as digits as its factorization.

22166213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330906.

The product of its digits is 864, while the sum is 23.

The square root of 22166213 is about 4708.1007848176. The cubic root of 22166213 is about 280.9078230103.

Subtracting 22166213 from its reverse (31266122), we obtain a palindrome (9099909).

The spelling of 22166213 in words is "twenty-two million, one hundred sixty-six thousand, two hundred thirteen".