8215054221 has 16 divisors (see below), whose sum is σ = 11957463360. Its totient is φ = 4975365120.

The previous prime is 8215054217. The next prime is 8215054247. The reversal of 8215054221 is 1224505128.

It is not a de Polignac number, because 8215054221 - 2² = 8215054217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8215054201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37716 + ... + 133613.

It is an arithmetic number, because the mean of its divisors is an integer number (747341460).

Almost surely, 2^8215054221 is an apocalyptic number.

It is an amenable number.

8215054221 is a deficient number, since it is larger than the sum of its proper divisors (3742409139).

8215054221 is a wasteful number, since it uses less digits than its factorization.

8215054221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172796.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 8215054221 is about 90636.9362953095. The cubic root of 8215054221 is about 2017.7629567164.

Adding to 8215054221 its reverse (1224505128), we get a palindrome (9439559349).

The spelling of 8215054221 in words is "eight billion, two hundred fifteen million, fifty-four thousand, two hundred twenty-one".