211221211222207 has 2 divisors, whose sum is σ = 211221211222208. Its totient is φ = 211221211222206.

The previous prime is 211221211222141. The next prime is 211221211222249. The reversal of 211221211222207 is 702222112122112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221211222207 is a prime.

It is a super-2 number, since 2×211221211222207² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221211222277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610605611103 + 105610605611104.

It is an arithmetic number, because the mean of its divisors is an integer number (105610605611104).

Almost surely, 2^{211221211222207} is an apocalyptic number.

211221211222207 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221211222207 is an equidigital number, since it uses as much as digits as its factorization.

211221211222207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

Adding to 211221211222207 its reverse (702222112122112), we get a palindrome (913443323344319).

The spelling of 211221211222207 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred seven".