222321021221 has 8 divisors (see below), whose sum is σ = 239703333240. Its totient is φ = 204978808512.

The previous prime is 222321021191. The next prime is 222321021281. The reversal of 222321021221 is 122120123222.

222321021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4056196 + 222316965025 = 2014^2 + 471505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 222321021221 - 2²⁶ = 222253912357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222321021193 and 222321021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222321021281) 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 7 ways as a sum of consecutive naturals, for example, 10013306 + ... + 10035483.

It is an arithmetic number, because the mean of its divisors is an integer number (29962916655).

Almost surely, 2^222321021221 is an apocalyptic number.

It is an amenable number.

222321021221 is a deficient number, since it is larger than the sum of its proper divisors (17382312019).

222321021221 is a wasteful number, since it uses less digits than its factorization.

222321021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20049655.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 222321021221 its reverse (122120123222), we get a palindrome (344441144443).

The spelling of 222321021221 in words is "two hundred twenty-two billion, three hundred twenty-one million, twenty-one thousand, two hundred twenty-one".