421000331 has 2 divisors, whose sum is σ = 421000332. Its totient is φ = 421000330.

The previous prime is 421000313. The next prime is 421000339. The reversal of 421000331 is 133000124.

Together with previous prime (421000313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421000331 - 2¹⁴ = 420983947 is a prime.

It is a super-2 number, since 2×421000331² = 354482557404219122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421000339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210500165 + 210500166.

It is an arithmetic number, because the mean of its divisors is an integer number (210500166).

Almost surely, 2^421000331 is an apocalyptic number.

421000331 is a deficient number, since it is larger than the sum of its proper divisors (1).

421000331 is an equidigital number, since it uses as much as digits as its factorization.

421000331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 421000331 is about 20518.2925946581. The cubic root of 421000331 is about 749.4813190057.

Adding to 421000331 its reverse (133000124), we get a palindrome (554000455).

The spelling of 421000331 in words is "four hundred twenty-one million, three hundred thirty-one", and thus it is an aban number.