8161021 has 8 divisors (see below), whose sum is σ = 9290304. Its totient is φ = 7096320.

The previous prime is 8161001. The next prime is 8161031. The reversal of 8161021 is 1201618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8161021 - 2⁵ = 8160989 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 8161021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15876 + ... + 16381.

It is an arithmetic number, because the mean of its divisors is an integer number (1161288).

Almost surely, 2^8161021 is an apocalyptic number.

It is an amenable number.

8161021 is a deficient number, since it is larger than the sum of its proper divisors (1129283).

8161021 is a wasteful number, since it uses less digits than its factorization.

8161021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32291.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 8161021 is about 2856.7500765730. The cubic root of 8161021 is about 201.3329383085.

Adding to 8161021 its reverse (1201618), we get a palindrome (9362639).

The spelling of 8161021 in words is "eight million, one hundred sixty-one thousand, twenty-one".