421516873 has 2 divisors, whose sum is σ = 421516874. Its totient is φ = 421516872.

The previous prime is 421516871. The next prime is 421516877. The reversal of 421516873 is 378615124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406748224 + 14768649 = 20168^2 + 3843^2 .

It is a cyclic number.

It is not a de Polignac number, because 421516873 - 2¹ = 421516871 is a prime.

Together with 421516871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (421516871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210758436 + 210758437.

It is an arithmetic number, because the mean of its divisors is an integer number (210758437).

Almost surely, 2^421516873 is an apocalyptic number.

It is an amenable number.

421516873 is a deficient number, since it is larger than the sum of its proper divisors (1).

421516873 is an equidigital number, since it uses as much as digits as its factorization.

421516873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 421516873 is about 20530.8760894415. The cubic root of 421516873 is about 749.7877165126.

The spelling of 421516873 in words is "four hundred twenty-one million, five hundred sixteen thousand, eight hundred seventy-three".