331344421 has 2 divisors, whose sum is σ = 331344422. Its totient is φ = 331344420.

The previous prime is 331344389. The next prime is 331344443. The reversal of 331344421 is 124443133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171321921 + 160022500 = 13089^2 + 12650^2 .

It is a cyclic number.

It is not a de Polignac number, because 331344421 - 2⁵ = 331344389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331344491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165672210 + 165672211.

It is an arithmetic number, because the mean of its divisors is an integer number (165672211).

Almost surely, 2^331344421 is an apocalyptic number.

It is an amenable number.

331344421 is a deficient number, since it is larger than the sum of its proper divisors (1).

331344421 is an equidigital number, since it uses as much as digits as its factorization.

331344421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 25.

The square root of 331344421 is about 18202.8684827419. The cubic root of 331344421 is about 691.9794876531.

Adding to 331344421 its reverse (124443133), we get a palindrome (455787554).

The spelling of 331344421 in words is "three hundred thirty-one million, three hundred forty-four thousand, four hundred twenty-one".