212223219997 has 2 divisors, whose sum is σ = 212223219998. Its totient is φ = 212223219996.

The previous prime is 212223219979. The next prime is 212223220051. The reversal of 212223219997 is 799912322212.

Together with previous prime (212223219979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162909911641 + 49313308356 = 403621^2 + 222066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212223219997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212223219997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212223519997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106111609998 + 106111609999.

It is an arithmetic number, because the mean of its divisors is an integer number (106111609999).

Almost surely, 2^212223219997 is an apocalyptic number.

It is an amenable number.

212223219997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212223219997 is an equidigital number, since it uses as much as digits as its factorization.

212223219997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The spelling of 212223219997 in words is "two hundred twelve billion, two hundred twenty-three million, two hundred nineteen thousand, nine hundred ninety-seven".