22177121 has 16 divisors (see below), whose sum is σ = 23789568. Its totient is φ = 20638800.

The previous prime is 22177093. The next prime is 22177153. The reversal of 22177121 is 12177122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22177121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (22177321) 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 15 ways as a sum of consecutive naturals, for example, 169226 + ... + 169356.

It is an arithmetic number, because the mean of its divisors is an integer number (1486848).

Almost surely, 2^22177121 is an apocalyptic number.

It is an amenable number.

22177121 is a deficient number, since it is larger than the sum of its proper divisors (1612447).

22177121 is a wasteful number, since it uses less digits than its factorization.

22177121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332.

The product of its digits is 392, while the sum is 23.

The square root of 22177121 is about 4709.2590712340. The cubic root of 22177121 is about 280.9538937284.

Subtracting from 22177121 its reverse (12177122), we obtain a palindrome (9999999).

The spelling of 22177121 in words is "twenty-two million, one hundred seventy-seven thousand, one hundred twenty-one".