8160021 has 10 divisors (see below), whose sum is σ = 12189782. Its totient is φ = 5439960.

The previous prime is 8160011. The next prime is 8160041. The reversal of 8160021 is 1200618.

It can be written as a sum of positive squares in only one way, i.e., 6812100 + 1347921 = 2610^2 + 1161^2 .

It is not a de Polignac number, because 8160021 - 2¹⁴ = 8143637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8159976 and 8160003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8160011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50290 + ... + 50451.

Almost surely, 2^8160021 is an apocalyptic number.

8160021 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8160021 is a deficient number, since it is larger than the sum of its proper divisors (4029761).

8160021 is a wasteful number, since it uses less digits than its factorization.

8160021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100753 (or 100744 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 8160021 is about 2856.5750471500. The cubic root of 8160021 is about 201.3247146168.

Adding to 8160021 its reverse (1200618), we get a palindrome (9360639).

It can be divided in two parts, 816002 and 1, that added together give a triangular number (816003 = T₁₂₇₇).

The spelling of 8160021 in words is "eight million, one hundred sixty thousand, twenty-one".