231414221 has 2 divisors, whose sum is σ = 231414222. Its totient is φ = 231414220.

The previous prime is 231414199. The next prime is 231414223. The reversal of 231414221 is 122414132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219928900 + 11485321 = 14830^2 + 3389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231414221 is a prime.

Together with 231414223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231414193 and 231414202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231414223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115707110 + 115707111.

It is an arithmetic number, because the mean of its divisors is an integer number (115707111).

Almost surely, 2^231414221 is an apocalyptic number.

It is an amenable number.

231414221 is a deficient number, since it is larger than the sum of its proper divisors (1).

231414221 is an equidigital number, since it uses as much as digits as its factorization.

231414221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 231414221 is about 15212.3049206884. The cubic root of 231414221 is about 613.9457744768.

Adding to 231414221 its reverse (122414132), we get a palindrome (353828353).

The spelling of 231414221 in words is "two hundred thirty-one million, four hundred fourteen thousand, two hundred twenty-one".