22221145 has 4 divisors (see below), whose sum is σ = 26665380. Its totient is φ = 17776912.

The previous prime is 22221109. The next prime is 22221161. The reversal of 22221145 is 54112222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3316041 + 18905104 = 1821^2 + 4348^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221145 - 2¹¹ = 22219097 is a prime.

It is a super-2 number, since 2×22221145² = 987558570222050, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2222110 + ... + 2222119.

It is an arithmetic number, because the mean of its divisors is an integer number (6666345).

Almost surely, 2^22221145 is an apocalyptic number.

It is an amenable number.

22221145 is a deficient number, since it is larger than the sum of its proper divisors (4444235).

22221145 is an equidigital number, since it uses as much as digits as its factorization.

22221145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444234.

The product of its digits is 320, while the sum is 19.

The square root of 22221145 is about 4713.9309498549. The cubic root of 22221145 is about 281.1396788718.

Adding to 22221145 its reverse (54112222), we get a palindrome (76333367).

It can be divided in two parts, 22221 and 145, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 22221145 in words is "twenty-two million, two hundred twenty-one thousand, one hundred forty-five".