22222045 has 4 divisors (see below), whose sum is σ = 26666460. Its totient is φ = 17777632.

The previous prime is 22221977. The next prime is 22222049. The reversal of 22222045 is 54022222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54022222 = 2 ⋅27011111.

It can be written as a sum of positive squares in 2 ways, for example, as 5354596 + 16867449 = 2314^2 + 4107^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222045 - 2²¹ = 20124893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222049) 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, 2222200 + ... + 2222209.

It is an arithmetic number, because the mean of its divisors is an integer number (6666615).

Almost surely, 2^22222045 is an apocalyptic number.

It is an amenable number.

22222045 is a deficient number, since it is larger than the sum of its proper divisors (4444415).

22222045 is an equidigital number, since it uses as much as digits as its factorization.

22222045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444414.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 22222045 is about 4714.0264106176. The cubic root of 22222045 is about 281.1434743902.

Adding to 22222045 its reverse (54022222), we get a palindrome (76244267).

The spelling of 22222045 in words is "twenty-two million, two hundred twenty-two thousand, forty-five".