8021217 has 4 divisors (see below), whose sum is σ = 10694960. Its totient is φ = 5347476.

The previous prime is 8021191. The next prime is 8021231. The reversal of 8021217 is 7121208.

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 8021217 - 2¹¹ = 8019169 is a prime.

It is a super-2 number, since 2×8021217² = 128679844322178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8021193 and 8021202.

It is not an unprimeable number, because it can be changed into a prime (8021257) 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, 1336867 + ... + 1336872.

It is an arithmetic number, because the mean of its divisors is an integer number (2673740).

Almost surely, 2^8021217 is an apocalyptic number.

It is an amenable number.

8021217 is a deficient number, since it is larger than the sum of its proper divisors (2673743).

8021217 is a wasteful number, since it uses less digits than its factorization.

8021217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673742.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 8021217 is about 2832.1753123703. The cubic root of 8021217 is about 200.1766522573.

Subtracting from 8021217 its reverse (7121208), we obtain a palindrome (900009).

The spelling of 8021217 in words is "eight million, twenty-one thousand, two hundred seventeen".