22145221121 has 4 divisors (see below), whose sum is σ = 22202150100. Its totient is φ = 22088292144.

The previous prime is 22145221097. The next prime is 22145221151. The reversal of 22145221121 is 12112254122.

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 1821582400 + 20323638721 = 42680^2 + 142561^2 .

It is a cyclic number.

It is not a de Polignac number, because 22145221121 - 2¹⁸ = 22144958977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22145221151) 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, 28463906 + ... + 28464683.

It is an arithmetic number, because the mean of its divisors is an integer number (5550537525).

Almost surely, 2^22145221121 is an apocalyptic number.

It is an amenable number.

22145221121 is a deficient number, since it is larger than the sum of its proper divisors (56928979).

22145221121 is an equidigital number, since it uses as much as digits as its factorization.

22145221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56928978.

The product of its digits is 640, while the sum is 23.

Adding to 22145221121 its reverse (12112254122), we get a palindrome (34257475243).

The spelling of 22145221121 in words is "twenty-two billion, one hundred forty-five million, two hundred twenty-one thousand, one hundred twenty-one".