8221251 has 8 divisors (see below), whose sum is σ = 11606544. Its totient is φ = 5158400.

The previous prime is 8221249. The next prime is 8221253. The reversal of 8221251 is 1521228.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8221249) and next prime (8221253).

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

It is a cyclic number.

It is not a de Polignac number, because 8221251 - 2¹ = 8221249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8221253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80550 + ... + 80651.

It is an arithmetic number, because the mean of its divisors is an integer number (1450818).

Almost surely, 2^8221251 is an apocalyptic number.

8221251 is a deficient number, since it is larger than the sum of its proper divisors (3385293).

8221251 is a wasteful number, since it uses less digits than its factorization.

8221251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161221.

The product of its digits is 320, while the sum is 21.

The square root of 8221251 is about 2867.2723972445. The cubic root of 8221251 is about 201.8270175463.

Multiplying 8221251 by its sum of digits (21), we get a palindrome (172646271).

Adding to 8221251 its reverse (1521228), we get a palindrome (9742479).

The spelling of 8221251 in words is "eight million, two hundred twenty-one thousand, two hundred fifty-one".