231212221211 has 2 divisors, whose sum is σ = 231212221212. Its totient is φ = 231212221210.

The previous prime is 231212221189. The next prime is 231212221231. The reversal of 231212221211 is 112122212132.

231212221211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (231212221231) can be obtained adding 231212221211 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231212221211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (231212221231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115606110605 + 115606110606.

It is an arithmetic number, because the mean of its divisors is an integer number (115606110606).

Almost surely, 2^231212221211 is an apocalyptic number.

231212221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

231212221211 is an equidigital number, since it uses as much as digits as its factorization.

231212221211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

Adding to 231212221211 its reverse (112122212132), we get a palindrome (343334433343).

It can be divided in two parts, 2 and 31212221211, that added together give a palindrome (31212221213).

The spelling of 231212221211 in words is "two hundred thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred eleven".