344211821 has 2 divisors, whose sum is σ = 344211822. Its totient is φ = 344211820.

The previous prime is 344211799. The next prime is 344211823. The reversal of 344211821 is 128112443.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342805225 + 1406596 = 18515^2 + 1186^2 .

It is a cyclic number.

It is not a de Polignac number, because 344211821 - 2²⁶ = 277102957 is a prime.

It is a super-2 number, since 2×344211821² = 236963555432272082, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 344211823, it forms a pair of twin primes.

It is a Chen 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 (344211823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172105910 + 172105911.

It is an arithmetic number, because the mean of its divisors is an integer number (172105911).

Almost surely, 2^344211821 is an apocalyptic number.

It is an amenable number.

344211821 is a deficient number, since it is larger than the sum of its proper divisors (1).

344211821 is an equidigital number, since it uses as much as digits as its factorization.

344211821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 26.

The square root of 344211821 is about 18552.9464236816. The cubic root of 344211821 is about 700.8233990959.

The spelling of 344211821 in words is "three hundred forty-four million, two hundred eleven thousand, eight hundred twenty-one".