8815421 has 2 divisors, whose sum is σ = 8815422. Its totient is φ = 8815420.

The previous prime is 8815403. The next prime is 8815427. The reversal of 8815421 is 1245188.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 1792921 = 2650^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 8815421 - 2¹⁰ = 8814397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8815427) 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, 4407710 + 4407711.

It is an arithmetic number, because the mean of its divisors is an integer number (4407711).

Almost surely, 2^8815421 is an apocalyptic number.

It is an amenable number.

8815421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8815421 is an equidigital number, since it uses as much as digits as its factorization.

8815421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 29.

The square root of 8815421 is about 2969.0774661500. The cubic root of 8815421 is about 206.5765496222.

The spelling of 8815421 in words is "eight million, eight hundred fifteen thousand, four hundred twenty-one".