212210000222221 has 2 divisors, whose sum is σ = 212210000222222. Its totient is φ = 212210000222220.

The previous prime is 212210000222189. The next prime is 212210000222243. The reversal of 212210000222221 is 122222000012212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117497903726025 + 94712096496196 = 10839645^2 + 9732014^2 .

It is a cyclic number.

It is not a de Polignac number, because 212210000222221 - 2⁵ = 212210000222189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212210000222821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106105000111110 + 106105000111111.

It is an arithmetic number, because the mean of its divisors is an integer number (106105000111111).

Almost surely, 2^{212210000222221} is an apocalyptic number.

It is an amenable number.

212210000222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212210000222221 is an equidigital number, since it uses as much as digits as its factorization.

212210000222221 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 19.

Adding to 212210000222221 its reverse (122222000012212), we get a palindrome (334432000234433).

The spelling of 212210000222221 in words is "two hundred twelve trillion, two hundred ten billion, two hundred twenty-two thousand, two hundred twenty-one".