22271605 has 4 divisors (see below), whose sum is σ = 26725932. Its totient is φ = 17817280.

The previous prime is 22271603. The next prime is 22271617. The reversal of 22271605 is 50617222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50617222 = 2 ⋅25308611.

It can be written as a sum of positive squares in 2 ways, for example, as 13645636 + 8625969 = 3694^2 + 2937^2 .

It is not a de Polignac number, because 22271605 - 2¹ = 22271603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22271605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22271603) 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, 2227156 + ... + 2227165.

It is an arithmetic number, because the mean of its divisors is an integer number (6681483).

Almost surely, 2^22271605 is an apocalyptic number.

It is an amenable number.

22271605 is a deficient number, since it is larger than the sum of its proper divisors (4454327).

22271605 is an equidigital number, since it uses as much as digits as its factorization.

22271605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454326.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 22271605 is about 4719.2801357834. The cubic root of 22271605 is about 281.3523229335.

Adding to 22271605 its reverse (50617222), we get a palindrome (72888827).

The spelling of 22271605 in words is "twenty-two million, two hundred seventy-one thousand, six hundred five".