8820421 has 2 divisors, whose sum is σ = 8820422. Its totient is φ = 8820420.

The previous prime is 8820397. The next prime is 8820451. The reversal of 8820421 is 1240288.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 52900 = 2961^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 8820421 - 2¹¹ = 8818373 is a prime.

It is equal to p₅₉₁₂₆₂ and since 8820421 and 591262 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8820451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4410210 + 4410211.

It is an arithmetic number, because the mean of its divisors is an integer number (4410211).

Almost surely, 2^8820421 is an apocalyptic number.

It is an amenable number.

8820421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8820421 is an equidigital number, since it uses as much as digits as its factorization.

8820421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 8820421 is about 2969.9193591746. The cubic root of 8820421 is about 206.6155981460.

The spelling of 8820421 in words is "eight million, eight hundred twenty thousand, four hundred twenty-one".