201222221 has 4 divisors (see below), whose sum is σ = 201277632. Its totient is φ = 201166812.

The previous prime is 201222211. The next prime is 201222223. The reversal of 201222221 is 122222102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201222221 - 2²² = 197027917 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 = 201222196 and 201222205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201222223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21845 + ... + 29658.

It is an arithmetic number, because the mean of its divisors is an integer number (50319408).

Almost surely, 2^201222221 is an apocalyptic number.

It is an amenable number.

201222221 is a deficient number, since it is larger than the sum of its proper divisors (55411).

201222221 is an equidigital number, since it uses as much as digits as its factorization.

201222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55410.

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

The square root of 201222221 is about 14185.2818442215. The cubic root of 201222221 is about 585.9923944933.

Adding to 201222221 its reverse (122222102), we get a palindrome (323444323).

The spelling of 201222221 in words is "two hundred one million, two hundred twenty-two thousand, two hundred twenty-one".