234021209 has 2 divisors, whose sum is σ = 234021210. Its totient is φ = 234021208.

The previous prime is 234021197. The next prime is 234021223. The reversal of 234021209 is 902120432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231131209 + 2890000 = 15203^2 + 1700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-234021209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (234021259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117010604 + 117010605.

It is an arithmetic number, because the mean of its divisors is an integer number (117010605).

Almost surely, 2^234021209 is an apocalyptic number.

It is an amenable number.

234021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

234021209 is an equidigital number, since it uses as much as digits as its factorization.

234021209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 234021209 is about 15297.7517629226. The cubic root of 234021209 is about 616.2426317269.

The spelling of 234021209 in words is "two hundred thirty-four million, twenty-one thousand, two hundred nine".