6875851021 has 6 divisors (see below), whose sum is σ = 7445448330. Its totient is φ = 6346939248.

The previous prime is 6875851013. The next prime is 6875851051. The reversal of 6875851021 is 1201585786.

It can be written as a sum of positive squares in 3 ways, for example, as 621255625 + 6254595396 = 24925^2 + 79086^2 .

It is not a de Polignac number, because 6875851021 - 2³ = 6875851013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6875851001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20342586 + ... + 20342923.

It is an arithmetic number, because the mean of its divisors is an integer number (1240908055).

Almost surely, 2^6875851021 is an apocalyptic number.

It is an amenable number.

6875851021 is a deficient number, since it is larger than the sum of its proper divisors (569597309).

6875851021 is a wasteful number, since it uses less digits than its factorization.

6875851021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40685535 (or 40685522 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 6875851021 is about 82920.7514498030. The cubic root of 6875851021 is about 1901.5546851413.

The spelling of 6875851021 in words is "six billion, eight hundred seventy-five million, eight hundred fifty-one thousand, twenty-one".