8071921 has 16 divisors (see below), whose sum is σ = 9692928. Its totient is φ = 6624000.

The previous prime is 8071907. The next prime is 8071933. The reversal of 8071921 is 1291708.

It is a cyclic number.

It is not a de Polignac number, because 8071921 - 2¹⁵ = 8039153 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 8071921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8071901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6121 + ... + 7321.

It is an arithmetic number, because the mean of its divisors is an integer number (605808).

Almost surely, 2^8071921 is an apocalyptic number.

It is an amenable number.

8071921 is a deficient number, since it is larger than the sum of its proper divisors (1621007).

8071921 is a wasteful number, since it uses less digits than its factorization.

8071921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 8071921 is about 2841.1126341629. The cubic root of 8071921 is about 200.5975545315.

The spelling of 8071921 in words is "eight million, seventy-one thousand, nine hundred twenty-one".