421718419 has 2 divisors, whose sum is σ = 421718420. Its totient is φ = 421718418.

The previous prime is 421718399. The next prime is 421718431. The reversal of 421718419 is 914817124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421718419 - 2⁷ = 421718291 is a prime.

It is a super-3 number, since 3×421718419³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421718449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210859209 + 210859210.

It is an arithmetic number, because the mean of its divisors is an integer number (210859210).

Almost surely, 2^421718419 is an apocalyptic number.

421718419 is a deficient number, since it is larger than the sum of its proper divisors (1).

421718419 is an equidigital number, since it uses as much as digits as its factorization.

421718419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 421718419 is about 20535.7838662175. The cubic root of 421718419 is about 749.9071997772.

The spelling of 421718419 in words is "four hundred twenty-one million, seven hundred eighteen thousand, four hundred nineteen".