421516373 has 2 divisors, whose sum is σ = 421516374. Its totient is φ = 421516372.

The previous prime is 421516327. The next prime is 421516399. The reversal of 421516373 is 373615124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211324369 + 210192004 = 14537^2 + 14498^2 .

It is a cyclic number.

It is not a de Polignac number, because 421516373 - 2²⁴ = 404739157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421516873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210758186 + 210758187.

It is an arithmetic number, because the mean of its divisors is an integer number (210758187).

Almost surely, 2^421516373 is an apocalyptic number.

It is an amenable number.

421516373 is a deficient number, since it is larger than the sum of its proper divisors (1).

421516373 is an equidigital number, since it uses as much as digits as its factorization.

421516373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 421516373 is about 20530.8639126560. The cubic root of 421516373 is about 749.7874200483.

The spelling of 421516373 in words is "four hundred twenty-one million, five hundred sixteen thousand, three hundred seventy-three".