22136405 has 4 divisors (see below), whose sum is σ = 26563692. Its totient is φ = 17709120.

The previous prime is 22136399. The next prime is 22136407. The reversal of 22136405 is 50463122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50463122 = 2 ⋅25231561.

It can be written as a sum of positive squares in 2 ways, for example, as 3179089 + 18957316 = 1783^2 + 4354^2 .

It is not a de Polignac number, because 22136405 - 2⁶ = 22136341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22136407) 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, 2213636 + ... + 2213645.

It is an arithmetic number, because the mean of its divisors is an integer number (6640923).

Almost surely, 2^22136405 is an apocalyptic number.

It is an amenable number.

22136405 is a deficient number, since it is larger than the sum of its proper divisors (4427287).

22136405 is an equidigital number, since it uses as much as digits as its factorization.

22136405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427286.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 22136405 is about 4704.9341121848. The cubic root of 22136405 is about 280.7818496573.

Adding to 22136405 its reverse (50463122), we get a palindrome (72599527).

The spelling of 22136405 in words is "twenty-two million, one hundred thirty-six thousand, four hundred five".