2212202221 has 2 divisors, whose sum is σ = 2212202222. Its totient is φ = 2212202220.

The previous prime is 2212202219. The next prime is 2212202249. The reversal of 2212202221 is 1222022122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1559144196 + 653058025 = 39486^2 + 25555^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212202221 - 2¹ = 2212202219 is a prime.

Together with 2212202219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2212202195 and 2212202204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212202021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106101110 + 1106101111.

It is an arithmetic number, because the mean of its divisors is an integer number (1106101111).

Almost surely, 2^2212202221 is an apocalyptic number.

It is an amenable number.

2212202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212202221 is an equidigital number, since it uses as much as digits as its factorization.

2212202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2212202221 is about 47034.0538439969. The cubic root of 2212202221 is about 1302.9915761476.

Adding to 2212202221 its reverse (1222022122), we get a palindrome (3434224343).

The spelling of 2212202221 in words is "two billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".