334409821 has 2 divisors, whose sum is σ = 334409822. Its totient is φ = 334409820.

The previous prime is 334409819. The next prime is 334409833. The reversal of 334409821 is 128904433.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214944921 + 119464900 = 14661^2 + 10930^2 .

It is a cyclic number.

It is not a de Polignac number, because 334409821 - 2¹ = 334409819 is a prime.

It is a super-2 number, since 2×334409821² = 223659856762504082, which contains 22 as substring.

Together with 334409819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (334409851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167204910 + 167204911.

It is an arithmetic number, because the mean of its divisors is an integer number (167204911).

Almost surely, 2^334409821 is an apocalyptic number.

It is an amenable number.

334409821 is a deficient number, since it is larger than the sum of its proper divisors (1).

334409821 is an equidigital number, since it uses as much as digits as its factorization.

334409821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 334409821 is about 18286.8756489456. The cubic root of 334409821 is about 694.1068671646.

The spelling of 334409821 in words is "three hundred thirty-four million, four hundred nine thousand, eight hundred twenty-one".