222201212221 has 4 divisors (see below), whose sum is σ = 222466053600. Its totient is φ = 221936370844.

The previous prime is 222201212183. The next prime is 222201212251. The reversal of 222201212221 is 122212102222.

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 222201212221 - 2²¹ = 222199115069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222201212251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132419431 + ... + 132421108.

It is an arithmetic number, because the mean of its divisors is an integer number (55616513400).

Almost surely, 2^222201212221 is an apocalyptic number.

It is an amenable number.

222201212221 is a deficient number, since it is larger than the sum of its proper divisors (264841379).

222201212221 is an equidigital number, since it uses as much as digits as its factorization.

222201212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264841378.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222201212221 its reverse (122212102222), we get a palindrome (344413314443).

The spelling of 222201212221 in words is "two hundred twenty-two billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".