827538682921 has 4 divisors (see below), whose sum is σ = 827618272000. Its totient is φ = 827459093844.

The previous prime is 827538682909. The next prime is 827538682939. The reversal of 827538682921 is 129286835728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 827538682921 - 2⁹ = 827538682409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 827538682921.

It is not an unprimeable number, because it can be changed into a prime (827538680921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39778941 + ... + 39799738.

It is an arithmetic number, because the mean of its divisors is an integer number (206904568000).

Almost surely, 2^827538682921 is an apocalyptic number.

It is an amenable number.

827538682921 is a deficient number, since it is larger than the sum of its proper divisors (79589079).

827538682921 is a wasteful number, since it uses less digits than its factorization.

827538682921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79589078.

The product of its digits is 23224320, while the sum is 61.

The spelling of 827538682921 in words is "eight hundred twenty-seven billion, five hundred thirty-eight million, six hundred eighty-two thousand, nine hundred twenty-one".