6821127837 has 12 divisors (see below), whose sum is σ = 9878073660. Its totient is φ = 4535726208.

The previous prime is 6821127827. The next prime is 6821127839. The reversal of 6821127837 is 7387211286.

It can be written as a sum of positive squares in 2 ways, for example, as 4550986521 + 2270141316 = 67461^2 + 47646^2 .

It is not a de Polignac number, because 6821127837 - 2³⁰ = 5747386013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6821127792 and 6821127801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6821127839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 970668 + ... + 977669.

It is an arithmetic number, because the mean of its divisors is an integer number (823172805).

Almost surely, 2^6821127837 is an apocalyptic number.

It is an amenable number.

6821127837 is a deficient number, since it is larger than the sum of its proper divisors (3056945823).

6821127837 is a wasteful number, since it uses less digits than its factorization.

6821127837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948732 (or 1948729 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 6821127837 is about 82590.1194877450. The cubic root of 6821127837 is about 1896.4965760219.

The spelling of 6821127837 in words is "six billion, eight hundred twenty-one million, one hundred twenty-seven thousand, eight hundred thirty-seven".