212011243 has 2 divisors, whose sum is σ = 212011244. Its totient is φ = 212011242.

The previous prime is 212011237. The next prime is 212011277. The reversal of 212011243 is 342110212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212011243 - 2⁹ = 212010731 is a prime.

It is not a weakly prime, because it can be changed into another prime (212011223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005621 + 106005622.

It is an arithmetic number, because the mean of its divisors is an integer number (106005622).

Almost surely, 2^212011243 is an apocalyptic number.

212011243 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011243 is an equidigital number, since it uses as much as digits as its factorization.

212011243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 212011243 is about 14560.6058596475. The cubic root of 212011243 is about 596.2837363106.

Adding to 212011243 its reverse (342110212), we get a palindrome (554121455).

The spelling of 212011243 in words is "two hundred twelve million, eleven thousand, two hundred forty-three".