22145155 has 4 divisors (see below), whose sum is σ = 26574192. Its totient is φ = 17716120.

The previous prime is 22145153. The next prime is 22145161. The reversal of 22145155 is 55154122.

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

It is not a de Polignac number, because 22145155 - 2¹ = 22145153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22145153) by changing a digit.

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, 2214511 + ... + 2214520.

It is an arithmetic number, because the mean of its divisors is an integer number (6643548).

Almost surely, 2^22145155 is an apocalyptic number.

22145155 is a deficient number, since it is larger than the sum of its proper divisors (4429037).

22145155 is an equidigital number, since it uses as much as digits as its factorization.

22145155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4429036.

The product of its digits is 2000, while the sum is 25.

The square root of 22145155 is about 4705.8638951844. The cubic root of 22145155 is about 280.8188402699.

Adding to 22145155 its reverse (55154122), we get a palindrome (77299277).

The spelling of 22145155 in words is "twenty-two million, one hundred forty-five thousand, one hundred fifty-five".