421331 has 2 divisors, whose sum is σ = 421332. Its totient is φ = 421330.

The previous prime is 421313. The next prime is 421339. The reversal of 421331 is 133124.

Together with previous prime (421313) 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 421331 - 2¹⁰ = 420307 is a prime.

It is a super-2 number, since 2×421331² = 355039623122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210665 + 210666.

It is an arithmetic number, because the mean of its divisors is an integer number (210666).

2⁴²¹³³¹ is an apocalyptic number.

421331 is a deficient number, since it is larger than the sum of its proper divisors (1).

421331 is an equidigital number, since it uses as much as digits as its factorization.

421331 is an evil number, because the sum of its binary digits is even.

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

The square root of 421331 is about 649.1001463565. The cubic root of 421331 is about 74.9677490967.

Adding to 421331 its reverse (133124), we get a palindrome (554455).

The spelling of 421331 in words is "four hundred twenty-one thousand, three hundred thirty-one".