234431221 has 2 divisors, whose sum is σ = 234431222. Its totient is φ = 234431220.

The previous prime is 234431213. The next prime is 234431237. The reversal of 234431221 is 122134432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194602500 + 39828721 = 13950^2 + 6311^2 .

It is a cyclic number.

It is not a de Polignac number, because 234431221 - 2³ = 234431213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 234431192 and 234431201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (234431521) 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 as a sum of consecutive naturals, namely, 117215610 + 117215611.

It is an arithmetic number, because the mean of its divisors is an integer number (117215611).

Almost surely, 2^234431221 is an apocalyptic number.

It is an amenable number.

234431221 is a deficient number, since it is larger than the sum of its proper divisors (1).

234431221 is an equidigital number, since it uses as much as digits as its factorization.

234431221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 234431221 is about 15311.1469524657. The cubic root of 234431221 is about 616.6023134534.

Adding to 234431221 its reverse (122134432), we get a palindrome (356565653).

The spelling of 234431221 in words is "two hundred thirty-four million, four hundred thirty-one thousand, two hundred twenty-one".