222210221 has 4 divisors (see below), whose sum is σ = 222396444. Its totient is φ = 222024000.

The previous prime is 222210211. The next prime is 222210223. The reversal of 222210221 is 122012222.

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 109956196 + 112254025 = 10486^2 + 10595^2 .

It is a cyclic number.

It is not a de Polignac number, because 222210221 - 2¹⁴ = 222193837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222210196 and 222210205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222210223) 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, 91310 + ... + 93711.

It is an arithmetic number, because the mean of its divisors is an integer number (55599111).

Almost surely, 2^222210221 is an apocalyptic number.

It is an amenable number.

222210221 is a deficient number, since it is larger than the sum of its proper divisors (186223).

222210221 is a wasteful number, since it uses less digits than its factorization.

222210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186222.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 222210221 is about 14906.7173113332. The cubic root of 222210221 is about 605.6959602471.

Adding to 222210221 its reverse (122012222), we get a palindrome (344222443).

The spelling of 222210221 in words is "two hundred twenty-two million, two hundred ten thousand, two hundred twenty-one".