222001212221 has 4 divisors (see below), whose sum is σ = 224037920700. Its totient is φ = 219964503744.

The previous prime is 222001212217. The next prime is 222001212239. The reversal of 222001212221 is 122212100222.

It is a happy number.

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 142766844025 + 79234368196 = 377845^2 + 281486^2 .

It is a cyclic number.

It is not a de Polignac number, because 222001212221 - 2² = 222001212217 is a prime.

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 222001212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001212241) 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, 1018354076 + ... + 1018354293.

It is an arithmetic number, because the mean of its divisors is an integer number (56009480175).

Almost surely, 2^222001212221 is an apocalyptic number.

It is an amenable number.

222001212221 is a deficient number, since it is larger than the sum of its proper divisors (2036708479).

222001212221 is a wasteful number, since it uses less digits than its factorization.

222001212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036708478.

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

Adding to 222001212221 its reverse (122212100222), we get a palindrome (344213312443).

The spelling of 222001212221 in words is "two hundred twenty-two billion, one million, two hundred twelve thousand, two hundred twenty-one".