8905221 has 24 divisors (see below), whose sum is σ = 14370720. Its totient is φ = 5478192.

The previous prime is 8905199. The next prime is 8905321. The reversal of 8905221 is 1225098.

It is not a de Polignac number, because 8905221 - 2⁵ = 8905189 is a prime.

It is a super-2 number, since 2×8905221² = 158605922117682, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8905021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1750 + ... + 4568.

It is an arithmetic number, because the mean of its divisors is an integer number (598780).

Almost surely, 2^8905221 is an apocalyptic number.

8905221 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8905221 is a deficient number, since it is larger than the sum of its proper divisors (5465499).

8905221 is a wasteful number, since it uses less digits than its factorization.

8905221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847 (or 2835 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 8905221 is about 2984.1616913297. The cubic root of 8905221 is about 207.2756252743.

The spelling of 8905221 in words is "eight million, nine hundred five thousand, two hundred twenty-one".