421320539 has 2 divisors, whose sum is σ = 421320540. Its totient is φ = 421320538.

The previous prime is 421320527. The next prime is 421320541. The reversal of 421320539 is 935023124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421320539 - 2⁸ = 421320283 is a prime.

Together with 421320541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421320139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210660269 + 210660270.

It is an arithmetic number, because the mean of its divisors is an integer number (210660270).

Almost surely, 2^421320539 is an apocalyptic number.

421320539 is a deficient number, since it is larger than the sum of its proper divisors (1).

421320539 is an equidigital number, since it uses as much as digits as its factorization.

421320539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 421320539 is about 20526.0940999499. The cubic root of 421320539 is about 749.6712864695.

The spelling of 421320539 in words is "four hundred twenty-one million, three hundred twenty thousand, five hundred thirty-nine".