304105421 has 2 divisors, whose sum is σ = 304105422. Its totient is φ = 304105420.

The previous prime is 304105409. The next prime is 304105423. The reversal of 304105421 is 124501403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290702500 + 13402921 = 17050^2 + 3661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-304105421 is a prime.

Together with 304105423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 304105393 and 304105402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304105423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152052710 + 152052711.

It is an arithmetic number, because the mean of its divisors is an integer number (152052711).

Almost surely, 2^304105421 is an apocalyptic number.

It is an amenable number.

304105421 is a deficient number, since it is larger than the sum of its proper divisors (1).

304105421 is an equidigital number, since it uses as much as digits as its factorization.

304105421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 304105421 is about 17438.6186666261. The cubic root of 304105421 is about 672.4727966774.

Adding to 304105421 its reverse (124501403), we get a palindrome (428606824).

The spelling of 304105421 in words is "three hundred four million, one hundred five thousand, four hundred twenty-one".