22213858 has 4 divisors (see below), whose sum is σ = 33320790. Its totient is φ = 11106928.

The previous prime is 22213847. The next prime is 22213859. The reversal of 22213858 is 85831222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85831222 = 2 ⋅42915611.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 3265249 = 4353^2 + 1807^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (22213859) 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 as a sum of consecutive naturals, namely, 5553463 + ... + 5553466.

Almost surely, 2^22213858 is an apocalyptic number.

22213858 is a deficient number, since it is larger than the sum of its proper divisors (11106932).

22213858 is a wasteful number, since it uses less digits than its factorization.

22213858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106931.

The product of its digits is 7680, while the sum is 31.

The square root of 22213858 is about 4713.1579646772. The cubic root of 22213858 is about 281.1089440496.

The spelling of 22213858 in words is "twenty-two million, two hundred thirteen thousand, eight hundred fifty-eight".