8899544021 has 2 divisors, whose sum is σ = 8899544022. Its totient is φ = 8899544020.

The previous prime is 8899543993. The next prime is 8899544033. The reversal of 8899544021 is 1204459988.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8319264100 + 580279921 = 91210^2 + 24089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8899544021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8899544221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4449772010 + 4449772011.

It is an arithmetic number, because the mean of its divisors is an integer number (4449772011).

Almost surely, 2^8899544021 is an apocalyptic number.

It is an amenable number.

8899544021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8899544021 is an equidigital number, since it uses as much as digits as its factorization.

8899544021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 8899544021 is about 94337.3946057448. The cubic root of 8899544021 is about 2072.3157061222.

The spelling of 8899544021 in words is "eight billion, eight hundred ninety-nine million, five hundred forty-four thousand, twenty-one".