8888821 has 2 divisors, whose sum is σ = 8888822. Its totient is φ = 8888820.

The previous prime is 8888813. The next prime is 8888839. The reversal of 8888821 is 1288888.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7918596 + 970225 = 2814^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 8888821 - 2³ = 8888813 is a prime.

It is a super-2 number, since 2×8888821² = 158022277540082, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8888801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4444410 + 4444411.

It is an arithmetic number, because the mean of its divisors is an integer number (4444411).

Almost surely, 2^8888821 is an apocalyptic number.

It is an amenable number.

8888821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8888821 is an equidigital number, since it uses as much as digits as its factorization.

8888821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65536, while the sum is 43.

The square root of 8888821 is about 2981.4125846652. The cubic root of 8888821 is about 207.1483063625.

The spelling of 8888821 in words is "eight million, eight hundred eighty-eight thousand, eight hundred twenty-one".