212644522243 has 2 divisors, whose sum is σ = 212644522244. Its totient is φ = 212644522242.

The previous prime is 212644522163. The next prime is 212644522303. The reversal of 212644522243 is 342225446212.

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-212644522243 is a prime.

It is not a weakly prime, because it can be changed into another prime (212644222243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106322261121 + 106322261122.

It is an arithmetic number, because the mean of its divisors is an integer number (106322261122).

Almost surely, 2^212644522243 is an apocalyptic number.

212644522243 is a deficient number, since it is larger than the sum of its proper divisors (1).

212644522243 is an equidigital number, since it uses as much as digits as its factorization.

212644522243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 37.

Adding to 212644522243 its reverse (342225446212), we get a palindrome (554869968455).

The spelling of 212644522243 in words is "two hundred twelve billion, six hundred forty-four million, five hundred twenty-two thousand, two hundred forty-three".