22161355 has 4 divisors (see below), whose sum is σ = 26593632. Its totient is φ = 17729080.

The previous prime is 22161343. The next prime is 22161371. The reversal of 22161355 is 55316122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55316122 = 2 ⋅27658061.

It is not a de Polignac number, because 22161355 - 2¹¹ = 22159307 is a prime.

It is a super-2 number, since 2×22161355² = 982251310872050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 2216131 + ... + 2216140.

It is an arithmetic number, because the mean of its divisors is an integer number (6648408).

Almost surely, 2^22161355 is an apocalyptic number.

22161355 is a deficient number, since it is larger than the sum of its proper divisors (4432277).

22161355 is an equidigital number, since it uses as much as digits as its factorization.

22161355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432276.

The product of its digits is 1800, while the sum is 25.

The square root of 22161355 is about 4707.5848372600. The cubic root of 22161355 is about 280.8873000353.

Adding to 22161355 its reverse (55316122), we get a palindrome (77477477).

The spelling of 22161355 in words is "twenty-two million, one hundred sixty-one thousand, three hundred fifty-five".