8116421 has 2 divisors, whose sum is σ = 8116422. Its totient is φ = 8116420.

The previous prime is 8116411. The next prime is 8116441. The reversal of 8116421 is 1246118.

8116421 = 2014² + 2015².

8116421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4060225 + 4056196 = 2015^2 + 2014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8116421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8116411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4058210 + 4058211.

It is an arithmetic number, because the mean of its divisors is an integer number (4058211).

Almost surely, 2^8116421 is an apocalyptic number.

8116421 is the 2015-th centered square number.

It is an amenable number.

8116421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8116421 is an equidigital number, since it uses as much as digits as its factorization.

8116421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 23.

The square root of 8116421 is about 2848.9333091527. The cubic root of 8116421 is about 200.9655064857.

The spelling of 8116421 in words is "eight million, one hundred sixteen thousand, four hundred twenty-one".