8216500821 has 8 divisors (see below), whose sum is σ = 10955757120. Its totient is φ = 5477455872.

The previous prime is 8216500783. The next prime is 8216500823. The reversal of 8216500821 is 1280056128.

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

It is not a de Polignac number, because 8216500821 - 2⁷ = 8216500693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216500823) 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, 106656 + ... + 166758.

It is an arithmetic number, because the mean of its divisors is an integer number (1369469640).

Almost surely, 2^8216500821 is an apocalyptic number.

It is an amenable number.

8216500821 is a deficient number, since it is larger than the sum of its proper divisors (2739256299).

8216500821 is a wasteful number, since it uses less digits than its factorization.

8216500821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105675.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 8216500821 is about 90644.9161343315. The cubic root of 8216500821 is about 2017.8813866339.

Adding to 8216500821 its reverse (1280056128), we get a palindrome (9496556949).

The spelling of 8216500821 in words is "eight billion, two hundred sixteen million, five hundred thousand, eight hundred twenty-one".