212221102123 has 2 divisors, whose sum is σ = 212221102124. Its totient is φ = 212221102122.

The previous prime is 212221102099. The next prime is 212221102139. The reversal of 212221102123 is 321201122212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212221102123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212221102123.

It is not a weakly prime, because it can be changed into another prime (212221102193) 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, 106110551061 + 106110551062.

It is an arithmetic number, because the mean of its divisors is an integer number (106110551062).

Almost surely, 2^212221102123 is an apocalyptic number.

212221102123 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221102123 is an equidigital number, since it uses as much as digits as its factorization.

212221102123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 212221102123 its reverse (321201122212), we get a palindrome (533422224335).

The spelling of 212221102123 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-three".