6694028021 has 2 divisors, whose sum is σ = 6694028022. Its totient is φ = 6694028020.

The previous prime is 6694027993. The next prime is 6694028027. The reversal of 6694028021 is 1208204966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6644043121 + 49984900 = 81511^2 + 7070^2 .

It is a cyclic number.

It is not a de Polignac number, because 6694028021 - 2⁶ = 6694027957 is a prime.

It is a super-2 number, since 2×6694028021² = 89620022291866352882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6694028027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3347014010 + 3347014011.

It is an arithmetic number, because the mean of its divisors is an integer number (3347014011).

Almost surely, 2^6694028021 is an apocalyptic number.

It is an amenable number.

6694028021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6694028021 is an equidigital number, since it uses as much as digits as its factorization.

6694028021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 6694028021 is about 81817.0399183446. The cubic root of 6694028021 is about 1884.6433452910.

The spelling of 6694028021 in words is "six billion, six hundred ninety-four million, twenty-eight thousand, twenty-one".