8221115 has 32 divisors (see below), whose sum is σ = 12265344. Its totient is φ = 5160960.

The previous prime is 8221111. The next prime is 8221139. The reversal of 8221115 is 5111228.

It is a happy number.

It is not a de Polignac number, because 8221115 - 2² = 8221111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8221111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24227 + ... + 24563.

It is an arithmetic number, because the mean of its divisors is an integer number (383292).

Almost surely, 2^8221115 is an apocalyptic number.

8221115 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

8221115 is a deficient number, since it is larger than the sum of its proper divisors (4044229).

8221115 is a wasteful number, since it uses less digits than its factorization.

8221115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407.

The product of its digits is 160, while the sum is 20.

The square root of 8221115 is about 2867.2486812274. The cubic root of 8221115 is about 201.8259046327.

The spelling of 8221115 in words is "eight million, two hundred twenty-one thousand, one hundred fifteen".