17843485421 has 2 divisors, whose sum is σ = 17843485422. Its totient is φ = 17843485420.

The previous prime is 17843485397. The next prime is 17843485423. The reversal of 17843485421 is 12458434871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17745969796 + 97515625 = 133214^2 + 9875^2 .

It is a cyclic number.

It is not a de Polignac number, because 17843485421 - 2¹⁰ = 17843484397 is a prime.

Together with 17843485423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17843485423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8921742710 + 8921742711.

It is an arithmetic number, because the mean of its divisors is an integer number (8921742711).

Almost surely, 2^17843485421 is an apocalyptic number.

It is an amenable number.

17843485421 is a deficient number, since it is larger than the sum of its proper divisors (1).

17843485421 is an equidigital number, since it uses as much as digits as its factorization.

17843485421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 860160, while the sum is 47.

The spelling of 17843485421 in words is "seventeen billion, eight hundred forty-three million, four hundred eighty-five thousand, four hundred twenty-one".