6824491021 has 2 divisors, whose sum is σ = 6824491022. Its totient is φ = 6824491020.

The previous prime is 6824491007. The next prime is 6824491031. The reversal of 6824491021 is 1201944286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6716622025 + 107868996 = 81955^2 + 10386^2 .

It is a cyclic number.

It is not a de Polignac number, because 6824491021 - 2²⁵ = 6790936589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6824491031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3412245510 + 3412245511.

It is an arithmetic number, because the mean of its divisors is an integer number (3412245511).

Almost surely, 2^6824491021 is an apocalyptic number.

It is an amenable number.

6824491021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6824491021 is an equidigital number, since it uses as much as digits as its factorization.

6824491021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 6824491021 is about 82610.4776708136. The cubic root of 6824491021 is about 1896.8082165162.

The spelling of 6824491021 in words is "six billion, eight hundred twenty-four million, four hundred ninety-one thousand, twenty-one".