340221123244421 has 2 divisors, whose sum is σ = 340221123244422. Its totient is φ = 340221123244420.

The previous prime is 340221123244361. The next prime is 340221123244427. The reversal of 340221123244421 is 124442321122043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317629743508900 + 22591379735521 = 17822170^2 + 4753039^2 .

It is an emirp because it is prime and its reverse (124442321122043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340221123244421 - 2¹⁸ = 340221122982277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340221123244427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170110561622210 + 170110561622211.

It is an arithmetic number, because the mean of its divisors is an integer number (170110561622211).

Almost surely, 2^{340221123244421} is an apocalyptic number.

It is an amenable number.

340221123244421 is a deficient number, since it is larger than the sum of its proper divisors (1).

340221123244421 is an equidigital number, since it uses as much as digits as its factorization.

340221123244421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 35.

Adding to 340221123244421 its reverse (124442321122043), we get a palindrome (464663444366464).

The spelling of 340221123244421 in words is "three hundred forty trillion, two hundred twenty-one billion, one hundred twenty-three million, two hundred forty-four thousand, four hundred twenty-one".