6888899921 has 2 divisors, whose sum is σ = 6888899922. Its totient is φ = 6888899920.

The previous prime is 6888899903. The next prime is 6888899929. The reversal of 6888899921 is 1299988886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3881913025 + 3006986896 = 62305^2 + 54836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6888899921 is a prime.

It is not a weakly prime, because it can be changed into another prime (6888899929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3444449960 + 3444449961.

It is an arithmetic number, because the mean of its divisors is an integer number (3444449961).

Almost surely, 2^6888899921 is an apocalyptic number.

It is an amenable number.

6888899921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6888899921 is an equidigital number, since it uses as much as digits as its factorization.

6888899921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35831808, while the sum is 68.

The square root of 6888899921 is about 82999.3971122682. The cubic root of 6888899921 is about 1902.7568401746.

The spelling of 6888899921 in words is "six billion, eight hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred twenty-one".