6811380021 has 24 divisors (see below), whose sum is σ = 9811081440. Its totient is φ = 4201338112.

The previous prime is 6811380019. The next prime is 6811380031. The reversal of 6811380021 is 1200831186.

It is not a de Polignac number, because 6811380021 - 2¹ = 6811380019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6811380031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15426 + ... + 117731.

It is an arithmetic number, because the mean of its divisors is an integer number (408795060).

Almost surely, 2^6811380021 is an apocalyptic number.

It is an amenable number.

6811380021 is a deficient number, since it is larger than the sum of its proper divisors (2999701419).

6811380021 is a wasteful number, since it uses less digits than its factorization.

6811380021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133253 (or 133236 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 6811380021 is about 82531.0851800702. The cubic root of 6811380021 is about 1895.5927414791.

The spelling of 6811380021 in words is "six billion, eight hundred eleven million, three hundred eighty thousand, twenty-one".