344221021 has 2 divisors, whose sum is σ = 344221022. Its totient is φ = 344221020.

The previous prime is 344220991. The next prime is 344221037. The reversal of 344221021 is 120122443.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198415396 + 145805625 = 14086^2 + 12075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-344221021 is a prime.

It is a super-2 number, since 2×344221021² = 236976222596564882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 344221021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344221051) 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, 172110510 + 172110511.

It is an arithmetic number, because the mean of its divisors is an integer number (172110511).

Almost surely, 2^344221021 is an apocalyptic number.

It is an amenable number.

344221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

344221021 is an equidigital number, since it uses as much as digits as its factorization.

344221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 344221021 is about 18553.1943610797. The cubic root of 344221021 is about 700.8296428461.

Adding to 344221021 its reverse (120122443), we get a palindrome (464343464).

The spelling of 344221021 in words is "three hundred forty-four million, two hundred twenty-one thousand, twenty-one".