1231223211 has 24 divisors (see below), whose sum is σ = 1832878320. Its totient is φ = 795842496.

The previous prime is 1231223179. The next prime is 1231223251. The reversal of 1231223211 is 1123221321.

1231223211 is a `hidden beast` number, since 1 + 231 + 223 + 211 = 666.

It is not a de Polignac number, because 1231223211 - 2⁵ = 1231223179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231223251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91260 + ... + 103878.

It is an arithmetic number, because the mean of its divisors is an integer number (76369930).

Almost surely, 2^1231223211 is an apocalyptic number.

1231223211 is a deficient number, since it is larger than the sum of its proper divisors (601655109).

1231223211 is a wasteful number, since it uses less digits than its factorization.

1231223211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12955 (or 12952 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1231223211 is about 35088.7903895247. The cubic root of 1231223211 is about 1071.7963278295.

Adding to 1231223211 its reverse (1123221321), we get a palindrome (2354444532).

The spelling of 1231223211 in words is "one billion, two hundred thirty-one million, two hundred twenty-three thousand, two hundred eleven".