231412221 has 20 divisors (see below), whose sum is σ = 349265532. Its totient is φ = 152679168.

The previous prime is 231412201. The next prime is 231412231. The reversal of 231412221 is 122214132.

It is a happy number.

231412221 is a `hidden beast` number, since 2 + 31 + 412 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 107868996 + 123543225 = 10386^2 + 11115^2 .

It is not a de Polignac number, because 231412221 - 2⁵ = 231412189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231412194 and 231412203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231412201) 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 19 ways as a sum of consecutive naturals, for example, 6870 + ... + 22583.

Almost surely, 2^231412221 is an apocalyptic number.

It is an amenable number.

231412221 is a deficient number, since it is larger than the sum of its proper divisors (117853311).

231412221 is an equidigital number, since it uses as much as digits as its factorization.

231412221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29562 (or 29553 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 231412221 is about 15212.2391842884. The cubic root of 231412221 is about 613.9440057939.

Adding to 231412221 its reverse (122214132), we get a palindrome (353626353).

It can be divided in two parts, 2314 and 12221, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 231412221 in words is "two hundred thirty-one million, four hundred twelve thousand, two hundred twenty-one".