131223211 has 12 divisors (see below), whose sum is σ = 156777712. Its totient is φ = 107583696.

The previous prime is 131223193. The next prime is 131223227. The reversal of 131223211 is 112322131.

It is not a de Polignac number, because 131223211 - 2⁵ = 131223179 is a prime.

It is a super-2 number, since 2×131223211² = 34439062210301042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131223241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14016 + ... + 21421.

Almost surely, 2^131223211 is an apocalyptic number.

131223211 is a deficient number, since it is larger than the sum of its proper divisors (25554501).

131223211 is an equidigital number, since it uses as much as digits as its factorization.

131223211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35490 (or 35467 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 131223211 is about 11455.2700099125. The cubic root of 131223211 is about 508.1636005094.

Adding to 131223211 its reverse (112322131), we get a palindrome (243545342).

The spelling of 131223211 in words is "one hundred thirty-one million, two hundred twenty-three thousand, two hundred eleven".