340203221 has 2 divisors, whose sum is σ = 340203222. Its totient is φ = 340203220.

The previous prime is 340203217. The next prime is 340203251. The reversal of 340203221 is 122302043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320052100 + 20151121 = 17890^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 340203221 - 2² = 340203217 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 340203221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340203251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170101610 + 170101611.

It is an arithmetic number, because the mean of its divisors is an integer number (170101611).

Almost surely, 2^340203221 is an apocalyptic number.

It is an amenable number.

340203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

340203221 is an equidigital number, since it uses as much as digits as its factorization.

340203221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 340203221 is about 18444.5986944688. The cubic root of 340203221 is about 698.0922345911.

Adding to 340203221 its reverse (122302043), we get a palindrome (462505264).

The spelling of 340203221 in words is "three hundred forty million, two hundred three thousand, two hundred twenty-one".