8032947821 has 4 divisors (see below), whose sum is σ = 8106644700. Its totient is φ = 7959250944.

The previous prime is 8032947817. The next prime is 8032947833. The reversal of 8032947821 is 1287492308.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2178555625 + 5854392196 = 46675^2 + 76514^2 .

It is a cyclic number.

It is not a de Polignac number, because 8032947821 - 2² = 8032947817 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 (8032947841) 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, 36848276 + ... + 36848493.

It is an arithmetic number, because the mean of its divisors is an integer number (2026661175).

Almost surely, 2^8032947821 is an apocalyptic number.

It is an amenable number.

8032947821 is a deficient number, since it is larger than the sum of its proper divisors (73696879).

8032947821 is a wasteful number, since it uses less digits than its factorization.

8032947821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73696878.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 8032947821 is about 89626.7137688312. The cubic root of 8032947821 is about 2002.7418910490.

The spelling of 8032947821 in words is "eight billion, thirty-two million, nine hundred forty-seven thousand, eight hundred twenty-one".