212436340639 has 2 divisors, whose sum is σ = 212436340640. Its totient is φ = 212436340638.

The previous prime is 212436340619. The next prime is 212436340693. The reversal of 212436340639 is 936043634212.

Together with next prime (212436340693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212436340639 - 2⁵ = 212436340607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212436340595 and 212436340604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212436340619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106218170319 + 106218170320.

It is an arithmetic number, because the mean of its divisors is an integer number (106218170320).

Almost surely, 2^212436340639 is an apocalyptic number.

212436340639 is a deficient number, since it is larger than the sum of its proper divisors (1).

212436340639 is an equidigital number, since it uses as much as digits as its factorization.

212436340639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 212436340639 in words is "two hundred twelve billion, four hundred thirty-six million, three hundred forty thousand, six hundred thirty-nine".