8121215976 has 16 divisors (see below), whose sum is σ = 20303040000. Its totient is φ = 2707071984.

The previous prime is 8121215969. The next prime is 8121215983. The reversal of 8121215976 is 6795121218.

It is an interprime number because it is at equal distance from previous prime (8121215969) and next prime (8121215983).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169191976 + ... + 169192023.

It is an arithmetic number, because the mean of its divisors is an integer number (1268940000).

Almost surely, 2^8121215976 is an apocalyptic number.

It is an amenable number.

8121215976 is an abundant number, since it is smaller than the sum of its proper divisors (12181824024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8121215976 is a wasteful number, since it uses less digits than its factorization.

8121215976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338384008 (or 338384004 counting only the distinct ones).

The product of its digits is 60480, while the sum is 42.

The square root of 8121215976 is about 90117.7894535813. The cubic root of 8121215976 is about 2010.0507380574.

The spelling of 8121215976 in words is "eight billion, one hundred twenty-one million, two hundred fifteen thousand, nine hundred seventy-six".