343770221 has 2 divisors, whose sum is σ = 343770222. Its totient is φ = 343770220.

The previous prime is 343770187. The next prime is 343770227. The reversal of 343770221 is 122077343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331422025 + 12348196 = 18205^2 + 3514^2 .

It is an emirp because it is prime and its reverse (122077343) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343770221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343770227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171885110 + 171885111.

It is an arithmetic number, because the mean of its divisors is an integer number (171885111).

Almost surely, 2^343770221 is an apocalyptic number.

It is an amenable number.

343770221 is a deficient number, since it is larger than the sum of its proper divisors (1).

343770221 is an equidigital number, since it uses as much as digits as its factorization.

343770221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 343770221 is about 18541.0415295366. The cubic root of 343770221 is about 700.5235681611.

The spelling of 343770221 in words is "three hundred forty-three million, seven hundred seventy thousand, two hundred twenty-one".