22221845 has 4 divisors (see below), whose sum is σ = 26666220. Its totient is φ = 17777472.

The previous prime is 22221833. The next prime is 22221847. The reversal of 22221845 is 54812222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54812222 = 2 ⋅27406111.

It can be written as a sum of positive squares in 2 ways, for example, as 8031556 + 14190289 = 2834^2 + 3767^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221845 - 2⁶ = 22221781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221847) 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, 2222180 + ... + 2222189.

It is an arithmetic number, because the mean of its divisors is an integer number (6666555).

Almost surely, 2^22221845 is an apocalyptic number.

It is an amenable number.

22221845 is a deficient number, since it is larger than the sum of its proper divisors (4444375).

22221845 is an equidigital number, since it uses as much as digits as its factorization.

22221845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444374.

The product of its digits is 2560, while the sum is 26.

The square root of 22221845 is about 4714.0051972818. The cubic root of 22221845 is about 281.1426309505.

The spelling of 22221845 in words is "twenty-two million, two hundred twenty-one thousand, eight hundred forty-five".