8722021 has 16 divisors (see below), whose sum is σ = 10944000. Its totient is φ = 6752880.

The previous prime is 8722019. The next prime is 8722027. The reversal of 8722021 is 1202278.

It is a cyclic number.

It is not a de Polignac number, because 8722021 - 2¹ = 8722019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8721983 and 8722001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8722027) 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, 17230 + ... + 17728.

It is an arithmetic number, because the mean of its divisors is an integer number (684000).

Almost surely, 2^8722021 is an apocalyptic number.

It is an amenable number.

8722021 is a deficient number, since it is larger than the sum of its proper divisors (2221979).

8722021 is a wasteful number, since it uses less digits than its factorization.

8722021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 8722021 is about 2953.3067907009. The cubic root of 8722021 is about 205.8443934386.

Adding to 8722021 its reverse (1202278), we get a palindrome (9924299).

The spelling of 8722021 in words is "eight million, seven hundred twenty-two thousand, twenty-one".