8221207 has 4 divisors (see below), whose sum is σ = 8231976. Its totient is φ = 8210440.

The previous prime is 8221177. The next prime is 8221211. The reversal of 8221207 is 7021228.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8221207 is a prime.

It is a Duffinian number.

8221207 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4144 + ... + 5797.

It is an arithmetic number, because the mean of its divisors is an integer number (2057994).

Almost surely, 2^8221207 is an apocalyptic number.

8221207 is a deficient number, since it is larger than the sum of its proper divisors (10769).

8221207 is an equidigital number, since it uses as much as digits as its factorization.

8221207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10768.

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

The square root of 8221207 is about 2867.2647244369. The cubic root of 8221207 is about 201.8266574874.

The spelling of 8221207 in words is "eight million, two hundred twenty-one thousand, two hundred seven".