222012212221 has 16 divisors (see below), whose sum is σ = 225297903600. Its totient is φ = 218748100608.

The previous prime is 222012212189. The next prime is 222012212251. The reversal of 222012212221 is 122212210222.

It can be written as a sum of positive squares in 8 ways, for example, as 19075476996 + 202936735225 = 138114^2 + 450485^2 .

It is a cyclic number.

It is not a de Polignac number, because 222012212221 - 2⁵ = 222012212189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222012212251) 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 15 ways as a sum of consecutive naturals, for example, 54506241 + ... + 54510313.

It is an arithmetic number, because the mean of its divisors is an integer number (14081118975).

Almost surely, 2^222012212221 is an apocalyptic number.

It is an amenable number.

222012212221 is a deficient number, since it is larger than the sum of its proper divisors (3285691379).

222012212221 is a wasteful number, since it uses less digits than its factorization.

222012212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6528.

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

Adding to 222012212221 its reverse (122212210222), we get a palindrome (344224422443).

The spelling of 222012212221 in words is "two hundred twenty-two billion, twelve million, two hundred twelve thousand, two hundred twenty-one".