231223215211 has 4 divisors (see below), whose sum is σ = 231292675800. Its totient is φ = 231153754624.

The previous prime is 231223215203. The next prime is 231223215227. The reversal of 231223215211 is 112512322132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231223215211 - 2³ = 231223215203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231223215241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34725301 + ... + 34731958.

It is an arithmetic number, because the mean of its divisors is an integer number (57823168950).

Almost surely, 2^231223215211 is an apocalyptic number.

231223215211 is a deficient number, since it is larger than the sum of its proper divisors (69460589).

231223215211 is an equidigital number, since it uses as much as digits as its factorization.

231223215211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69460588.

The product of its digits is 1440, while the sum is 25.

Adding to 231223215211 its reverse (112512322132), we get a palindrome (343735537343).

The spelling of 231223215211 in words is "two hundred thirty-one billion, two hundred twenty-three million, two hundred fifteen thousand, two hundred eleven".