22011201221 has 4 divisors (see below), whose sum is σ = 22138433772. Its totient is φ = 21883968672.

The previous prime is 22011201217. The next prime is 22011201241. The reversal of 22011201221 is 12210211022.

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 9341222500 + 12669978721 = 96650^2 + 112561^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011201221 - 2² = 22011201217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22011201196 and 22011201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011201211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63616016 + ... + 63616361.

It is an arithmetic number, because the mean of its divisors is an integer number (5534608443).

Almost surely, 2^22011201221 is an apocalyptic number.

It is an amenable number.

22011201221 is a deficient number, since it is larger than the sum of its proper divisors (127232551).

22011201221 is a wasteful number, since it uses less digits than its factorization.

22011201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127232550.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22011201221 its reverse (12210211022), we get a palindrome (34221412243).

The spelling of 22011201221 in words is "twenty-two billion, eleven million, two hundred one thousand, two hundred twenty-one".