8673717421 has 2 divisors, whose sum is σ = 8673717422. Its totient is φ = 8673717420.

The previous prime is 8673717419. The next prime is 8673717433. The reversal of 8673717421 is 1247173768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8623165321 + 50552100 = 92861^2 + 7110^2 .

It is a cyclic number.

It is not a de Polignac number, because 8673717421 - 2¹ = 8673717419 is a prime.

Together with 8673717419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8673717461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4336858710 + 4336858711.

It is an arithmetic number, because the mean of its divisors is an integer number (4336858711).

Almost surely, 2^8673717421 is an apocalyptic number.

It is an amenable number.

8673717421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8673717421 is an equidigital number, since it uses as much as digits as its factorization.

8673717421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 46.

The square root of 8673717421 is about 93132.7945516508. The cubic root of 8673717421 is about 2054.6369295609.

The spelling of 8673717421 in words is "eight billion, six hundred seventy-three million, seven hundred seventeen thousand, four hundred twenty-one".