22212012210221 has 4 divisors (see below), whose sum is σ = 22212038843772. Its totient is φ = 22211985576672.

The previous prime is 22212012210203. The next prime is 22212012210257. The reversal of 22212012210221 is 12201221021222.

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 6620483380900 + 15591528829321 = 2573030^2 + 3948611^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212012210221 - 2¹⁴ = 22212012193837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22212012210193 and 22212012210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212012210121) 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, 12023960 + ... + 13747713.

It is an arithmetic number, because the mean of its divisors is an integer number (5553009710943).

Almost surely, 2^{22212012210221} is an apocalyptic number.

It is an amenable number.

22212012210221 is a deficient number, since it is larger than the sum of its proper divisors (26633551).

22212012210221 is an equidigital number, since it uses as much as digits as its factorization.

22212012210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26633550.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22212012210221 its reverse (12201221021222), we get a palindrome (34413233231443).

The spelling of 22212012210221 in words is "twenty-two trillion, two hundred twelve billion, twelve million, two hundred ten thousand, two hundred twenty-one".