22100405 has 4 divisors (see below), whose sum is σ = 26520492. Its totient is φ = 17680320.

The previous prime is 22100347. The next prime is 22100431. The reversal of 22100405 is 50400122.

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 4977361 + 17123044 = 2231^2 + 4138^2 .

It is not a de Polignac number, because 22100405 - 2⁶ = 22100341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22100405.

It is a congruent 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, 2210036 + ... + 2210045.

It is an arithmetic number, because the mean of its divisors is an integer number (6630123).

Almost surely, 2^22100405 is an apocalyptic number.

It is an amenable number.

22100405 is a deficient number, since it is larger than the sum of its proper divisors (4420087).

22100405 is an equidigital number, since it uses as much as digits as its factorization.

22100405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4420086.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 22100405 is about 4701.1067845774. The cubic root of 22100405 is about 280.6295570711.

Adding to 22100405 its reverse (50400122), we get a palindrome (72500527).

The spelling of 22100405 in words is "twenty-two million, one hundred thousand, four hundred five".