340315021 has 2 divisors, whose sum is σ = 340315022. Its totient is φ = 340315020.

The previous prime is 340315013. The next prime is 340315039. The reversal of 340315021 is 120513043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302934025 + 37380996 = 17405^2 + 6114^2 .

It is a cyclic number.

It is not a de Polignac number, because 340315021 - 2³ = 340315013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 340315021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340315121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170157510 + 170157511.

It is an arithmetic number, because the mean of its divisors is an integer number (170157511).

Almost surely, 2^340315021 is an apocalyptic number.

It is an amenable number.

340315021 is a deficient number, since it is larger than the sum of its proper divisors (1).

340315021 is an equidigital number, since it uses as much as digits as its factorization.

340315021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 340315021 is about 18447.6291430633. The cubic root of 340315021 is about 698.1686968927.

Adding to 340315021 its reverse (120513043), we get a palindrome (460828064).

The spelling of 340315021 in words is "three hundred forty million, three hundred fifteen thousand, twenty-one".