8020287921 has 4 divisors (see below), whose sum is σ = 10693717232. Its totient is φ = 5346858612.

The previous prime is 8020287851. The next prime is 8020287929. The reversal of 8020287921 is 1297820208.

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 not a de Polignac number, because 8020287921 - 2¹⁴ = 8020271537 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 8020287921.

It is not an unprimeable number, because it can be changed into a prime (8020287929) 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, 1336714651 + ... + 1336714656.

It is an arithmetic number, because the mean of its divisors is an integer number (2673429308).

Almost surely, 2^8020287921 is an apocalyptic number.

It is an amenable number.

8020287921 is a deficient number, since it is larger than the sum of its proper divisors (2673429311).

8020287921 is a wasteful number, since it uses less digits than its factorization.

8020287921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673429310.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 8020287921 is about 89556.0602137008. The cubic root of 8020287921 is about 2001.6892329277.

It can be divided in two parts, 8020287 and 921, that added together give a palindrome (8021208).

The spelling of 8020287921 in words is "eight billion, twenty million, two hundred eighty-seven thousand, nine hundred twenty-one".