344217421 has 2 divisors, whose sum is σ = 344217422. Its totient is φ = 344217420.

The previous prime is 344217403. The next prime is 344217431. The reversal of 344217421 is 124712443.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344102500 + 114921 = 18550^2 + 339^2 .

It is a cyclic number.

It is not a de Polignac number, because 344217421 - 2⁵ = 344217389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 344217421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344217431) 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, 172108710 + 172108711.

It is an arithmetic number, because the mean of its divisors is an integer number (172108711).

Almost surely, 2^344217421 is an apocalyptic number.

It is an amenable number.

344217421 is a deficient number, since it is larger than the sum of its proper divisors (1).

344217421 is an equidigital number, since it uses as much as digits as its factorization.

344217421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 28.

The square root of 344217421 is about 18553.0973424924. The cubic root of 344217421 is about 700.8271996527.

Adding to 344217421 its reverse (124712443), we get a palindrome (468929864).

The spelling of 344217421 in words is "three hundred forty-four million, two hundred seventeen thousand, four hundred twenty-one".