22001201221 has 16 divisors (see below), whose sum is σ = 23407004160. Its totient is φ = 20620710000.

The previous prime is 22001201213. The next prime is 22001201227. The reversal of 22001201221 is 12210210022.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 22001201221 - 2³ = 22001201213 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 (22001201227) 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 15 ways as a sum of consecutive naturals, for example, 1593096 + ... + 1606846.

It is an arithmetic number, because the mean of its divisors is an integer number (1462937760).

Almost surely, 2^22001201221 is an apocalyptic number.

It is an amenable number.

22001201221 is a deficient number, since it is larger than the sum of its proper divisors (1405802939).

22001201221 is a wasteful number, since it uses less digits than its factorization.

22001201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14664.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22001201221 its reverse (12210210022), we get a palindrome (34211411243).

The spelling of 22001201221 in words is "twenty-two billion, one million, two hundred one thousand, two hundred twenty-one".