212440311243 has 6 divisors (see below), whose sum is σ = 306858227364. Its totient is φ = 141626874156.

The previous prime is 212440311163. The next prime is 212440311271. The reversal of 212440311243 is 342113044212.

212440311243 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 403 + 11 + 243 = 666.

It is not a de Polignac number, because 212440311243 - 2²² = 212436116939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212440318243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11802239505 + ... + 11802239522.

It is an arithmetic number, because the mean of its divisors is an integer number (51143037894).

Almost surely, 2^212440311243 is an apocalyptic number.

212440311243 is a deficient number, since it is larger than the sum of its proper divisors (94417916121).

212440311243 is a wasteful number, since it uses less digits than its factorization.

212440311243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23604479033 (or 23604479030 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 212440311243 its reverse (342113044212), we get a palindrome (554553355455).

The spelling of 212440311243 in words is "two hundred twelve billion, four hundred forty million, three hundred eleven thousand, two hundred forty-three".