340347221 has 2 divisors, whose sum is σ = 340347222. Its totient is φ = 340347220.

The previous prime is 340347197. The next prime is 340347251. The reversal of 340347221 is 122743043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 323496196 + 16851025 = 17986^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 340347221 - 2¹⁸ = 340085077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340347251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170173610 + 170173611.

It is an arithmetic number, because the mean of its divisors is an integer number (170173611).

Almost surely, 2^340347221 is an apocalyptic number.

It is an amenable number.

340347221 is a deficient number, since it is larger than the sum of its proper divisors (1).

340347221 is an equidigital number, since it uses as much as digits as its factorization.

340347221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 340347221 is about 18448.5018632950. The cubic root of 340347221 is about 698.1907160237.

The spelling of 340347221 in words is "three hundred forty million, three hundred forty-seven thousand, two hundred twenty-one".