8425221 has 8 divisors (see below), whose sum is σ = 12838464. Its totient is φ = 4814400.

The previous prime is 8425187. The next prime is 8425237. The reversal of 8425221 is 1225248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8425221 - 2¹³ = 8417029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8425191 and 8425200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8425321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200580 + ... + 200621.

It is an arithmetic number, because the mean of its divisors is an integer number (1604808).

Almost surely, 2^8425221 is an apocalyptic number.

It is an amenable number.

8425221 is a deficient number, since it is larger than the sum of its proper divisors (4413243).

8425221 is a wasteful number, since it uses less digits than its factorization.

8425221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401211.

The product of its digits is 1280, while the sum is 24.

The square root of 8425221 is about 2902.6231240035. The cubic root of 8425221 is about 203.4825167545.

It can be divided in two parts, 8425 and 221, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 8425221 in words is "eight million, four hundred twenty-five thousand, two hundred twenty-one".