222210210221 has 8 divisors (see below), whose sum is σ = 222341247480. Its totient is φ = 222079214592.

The previous prime is 222210210203. The next prime is 222210210223. The reversal of 222210210221 is 122012012222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3243302500 + 218966907721 = 56950^2 + 467939^2 .

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 222210210221 - 2¹⁰ = 222210209197 is a prime.

It is a super-2 number, since 2×222210210221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222210210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222210210223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24219791 + ... + 24228963.

It is an arithmetic number, because the mean of its divisors is an integer number (27792655935).

Almost surely, 2^222210210221 is an apocalyptic number.

It is an amenable number.

222210210221 is a deficient number, since it is larger than the sum of its proper divisors (131037259).

222210210221 is an equidigital number, since it uses as much as digits as its factorization.

222210210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20815.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222210210221 its reverse (122012012222), we get a palindrome (344222222443).

The spelling of 222210210221 in words is "two hundred twenty-two billion, two hundred ten million, two hundred ten thousand, two hundred twenty-one".