212231231 has 2 divisors, whose sum is σ = 212231232. Its totient is φ = 212231230.

The previous prime is 212231219. The next prime is 212231237. The reversal of 212231231 is 132132212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212231231 - 2⁶ = 212231167 is a prime.

It is a super-2 number, since 2×212231231² = 90084190823550722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212231237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106115615 + 106115616.

It is an arithmetic number, because the mean of its divisors is an integer number (106115616).

Almost surely, 2^212231231 is an apocalyptic number.

212231231 is a deficient number, since it is larger than the sum of its proper divisors (1).

212231231 is an equidigital number, since it uses as much as digits as its factorization.

212231231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 212231231 is about 14568.1581196801. The cubic root of 212231231 is about 596.4899045003.

Adding to 212231231 its reverse (132132212), we get a palindrome (344363443).

The spelling of 212231231 in words is "two hundred twelve million, two hundred thirty-one thousand, two hundred thirty-one".