212200122221 has 2 divisors, whose sum is σ = 212200122222. Its totient is φ = 212200122220.

The previous prime is 212200122179. The next prime is 212200122241. The reversal of 212200122221 is 122221002212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140520769321 + 71679352900 = 374861^2 + 267730^2 .

It is a cyclic number.

It is not a de Polignac number, because 212200122221 - 2¹⁸ = 212199860077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212200122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212200122241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106100061110 + 106100061111.

It is an arithmetic number, because the mean of its divisors is an integer number (106100061111).

Almost surely, 2^212200122221 is an apocalyptic number.

It is an amenable number.

212200122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212200122221 is an equidigital number, since it uses as much as digits as its factorization.

212200122221 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 17.

Adding to 212200122221 its reverse (122221002212), we get a palindrome (334421124433).

The spelling of 212200122221 in words is "two hundred twelve billion, two hundred million, one hundred twenty-two thousand, two hundred twenty-one".