304402421 has 2 divisors, whose sum is σ = 304402422. Its totient is φ = 304402420.

The previous prime is 304402411. The next prime is 304402429. The reversal of 304402421 is 124204403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198415396 + 105987025 = 14086^2 + 10295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-304402421 is a prime.

It is a super-2 number, since 2×304402421² = 185321667821322482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 304402393 and 304402402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304402429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152201210 + 152201211.

It is an arithmetic number, because the mean of its divisors is an integer number (152201211).

Almost surely, 2^304402421 is an apocalyptic number.

It is an amenable number.

304402421 is a deficient number, since it is larger than the sum of its proper divisors (1).

304402421 is an equidigital number, since it uses as much as digits as its factorization.

304402421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 304402421 is about 17447.1321712194. The cubic root of 304402421 is about 672.6916456059.

Adding to 304402421 its reverse (124204403), we get a palindrome (428606824).

The spelling of 304402421 in words is "three hundred four million, four hundred two thousand, four hundred twenty-one".