234830021 has 2 divisors, whose sum is σ = 234830022. Its totient is φ = 234830020.

The previous prime is 234829999. The next prime is 234830041. The reversal of 234830021 is 120038432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130279396 + 104550625 = 11414^2 + 10225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-234830021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (234830041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117415010 + 117415011.

It is an arithmetic number, because the mean of its divisors is an integer number (117415011).

Almost surely, 2^234830021 is an apocalyptic number.

It is an amenable number.

234830021 is a deficient number, since it is larger than the sum of its proper divisors (1).

234830021 is an equidigital number, since it uses as much as digits as its factorization.

234830021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 234830021 is about 15324.1646101835. The cubic root of 234830021 is about 616.9517573769.

Adding to 234830021 its reverse (120038432), we get a palindrome (354868453).

The spelling of 234830021 in words is "two hundred thirty-four million, eight hundred thirty thousand, twenty-one".