421516939 has 2 divisors, whose sum is σ = 421516940. Its totient is φ = 421516938.

The previous prime is 421516877. The next prime is 421516969. The reversal of 421516939 is 939615124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421516939 - 2²¹ = 419419787 is a prime.

It is not a weakly prime, because it can be changed into another prime (421516969) 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, 210758469 + 210758470.

It is an arithmetic number, because the mean of its divisors is an integer number (210758470).

Almost surely, 2^421516939 is an apocalyptic number.

421516939 is a deficient number, since it is larger than the sum of its proper divisors (1).

421516939 is an equidigital number, since it uses as much as digits as its factorization.

421516939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 421516939 is about 20530.8776967766. The cubic root of 421516939 is about 749.7877556458.

The spelling of 421516939 in words is "four hundred twenty-one million, five hundred sixteen thousand, nine hundred thirty-nine".