6678100921 has 2 divisors, whose sum is σ = 6678100922. Its totient is φ = 6678100920.

The previous prime is 6678100883. The next prime is 6678100927. The reversal of 6678100921 is 1290018766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4437025321 + 2241075600 = 66611^2 + 47340^2 .

It is a cyclic number.

It is not a de Polignac number, because 6678100921 - 2²⁷ = 6543883193 is a prime.

It is a super-2 number, since 2×6678100921² = 89194063822122096482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6678100927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3339050460 + 3339050461.

It is an arithmetic number, because the mean of its divisors is an integer number (3339050461).

Almost surely, 2^6678100921 is an apocalyptic number.

It is an amenable number.

6678100921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6678100921 is an equidigital number, since it uses as much as digits as its factorization.

6678100921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 6678100921 is about 81719.6483166686. The cubic root of 6678100921 is about 1883.1474477112.

The spelling of 6678100921 in words is "six billion, six hundred seventy-eight million, one hundred thousand, nine hundred twenty-one".