850003421 has 2 divisors, whose sum is σ = 850003422. Its totient is φ = 850003420.

The previous prime is 850003397. The next prime is 850003439. The reversal of 850003421 is 124300058.

850003421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 704318521 + 145684900 = 26539^2 + 12070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850003421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850003471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425001710 + 425001711.

It is an arithmetic number, because the mean of its divisors is an integer number (425001711).

Almost surely, 2^850003421 is an apocalyptic number.

It is an amenable number.

850003421 is a deficient number, since it is larger than the sum of its proper divisors (1).

850003421 is an equidigital number, since it uses as much as digits as its factorization.

850003421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 850003421 is about 29154.8181438334. The cubic root of 850003421 is about 947.2695080096.

Adding to 850003421 its reverse (124300058), we get a palindrome (974303479).

The spelling of 850003421 in words is "eight hundred fifty million, three thousand, four hundred twenty-one".