212440231 has 2 divisors, whose sum is σ = 212440232. Its totient is φ = 212440230.

The previous prime is 212440223. The next prime is 212440289. The reversal of 212440231 is 132044212.

212440231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212440231 - 2³ = 212440223 is a prime.

It is a super-2 number, since 2×212440231² = 90261703494666722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212440199 and 212440208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212440201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106220115 + 106220116.

It is an arithmetic number, because the mean of its divisors is an integer number (106220116).

Almost surely, 2^212440231 is an apocalyptic number.

212440231 is a deficient number, since it is larger than the sum of its proper divisors (1).

212440231 is an equidigital number, since it uses as much as digits as its factorization.

212440231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 212440231 is about 14575.3295331529. The cubic root of 212440231 is about 596.6856430336.

Adding to 212440231 its reverse (132044212), we get a palindrome (344484443).

The spelling of 212440231 in words is "two hundred twelve million, four hundred forty thousand, two hundred thirty-one".