2212222011221 has 2 divisors, whose sum is σ = 2212222011222. Its totient is φ = 2212222011220.

The previous prime is 2212222011217. The next prime is 2212222011283. The reversal of 2212222011221 is 1221102222122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1479845487121 + 732376524100 = 1216489^2 + 855790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212222011221 - 2² = 2212222011217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2212222011193 and 2212222011202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212222011121) 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 as a sum of consecutive naturals, namely, 1106111005610 + 1106111005611.

It is an arithmetic number, because the mean of its divisors is an integer number (1106111005611).

Almost surely, 2^{2212222011221} is an apocalyptic number.

It is an amenable number.

2212222011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212222011221 is an equidigital number, since it uses as much as digits as its factorization.

2212222011221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2212222011221 its reverse (1221102222122), we get a palindrome (3433324233343).

The spelling of 2212222011221 in words is "two trillion, two hundred twelve billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".