6750004021 has 2 divisors, whose sum is σ = 6750004022. Its totient is φ = 6750004020.

The previous prime is 6750003989. The next prime is 6750004033. The reversal of 6750004021 is 1204000576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6025640625 + 724363396 = 77625^2 + 26914^2 .

It is a cyclic number.

It is not a de Polignac number, because 6750004021 - 2⁵ = 6750003989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6750004061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3375002010 + 3375002011.

It is an arithmetic number, because the mean of its divisors is an integer number (3375002011).

Almost surely, 2^6750004021 is an apocalyptic number.

It is an amenable number.

6750004021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6750004021 is an equidigital number, since it uses as much as digits as its factorization.

6750004021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 6750004021 is about 82158.4080967980. The cubic root of 6750004021 is about 1889.8819501121.

Adding to 6750004021 its reverse (1204000576), we get a palindrome (7954004597).

The spelling of 6750004021 in words is "six billion, seven hundred fifty million, four thousand, twenty-one".