8725221 has 12 divisors (see below), whose sum is σ = 12871872. Its totient is φ = 5692776.

The previous prime is 8725219. The next prime is 8725243. The reversal of 8725221 is 1225278.

8725221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8725221 - 2¹ = 8725219 is a prime.

It is a super-2 number, since 2×8725221² = 152258962997682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8725021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9891 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (1072656).

Almost surely, 2^8725221 is an apocalyptic number.

It is an amenable number.

8725221 is a deficient number, since it is larger than the sum of its proper divisors (4146651).

8725221 is a wasteful number, since it uses less digits than its factorization.

8725221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20680 (or 20677 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 8725221 is about 2953.8485066096. The cubic root of 8725221 is about 205.8695642685.

The spelling of 8725221 in words is "eight million, seven hundred twenty-five thousand, two hundred twenty-one".