231222211 has 16 divisors (see below), whose sum is σ = 261098496. Its totient is φ = 202860000.

The previous prime is 231222209. The next prime is 231222259. The reversal of 231222211 is 112222132.

It is a happy number.

231222211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 231222211 - 2¹ = 231222209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231222011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166741 + ... + 168121.

It is an arithmetic number, because the mean of its divisors is an integer number (16318656).

Almost surely, 2^231222211 is an apocalyptic number.

231222211 is a deficient number, since it is larger than the sum of its proper divisors (29876285).

231222211 is a wasteful number, since it uses less digits than its factorization.

231222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914.

The product of its digits is 96, while the sum is 16.

The square root of 231222211 is about 15205.9926016028. The cubic root of 231222211 is about 613.7759255851.

Adding to 231222211 its reverse (112222132), we get a palindrome (343444343).

It can be divided in two parts, 2 and 31222211, that added together give a palindrome (31222213).

The spelling of 231222211 in words is "two hundred thirty-one million, two hundred twenty-two thousand, two hundred eleven".