7821211976 has 16 divisors (see below), whose sum is σ = 14679705600. Its totient is φ = 3906623824.

The previous prime is 7821211949. The next prime is 7821212011. The reversal of 7821211976 is 6791121287.

It is a super-2 number, since 2×7821211976² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489416 + ... + 505143.

It is an arithmetic number, because the mean of its divisors is an integer number (917481600).

Almost surely, 2^7821211976 is an apocalyptic number.

It is an amenable number.

7821211976 is a deficient number, since it is larger than the sum of its proper divisors (6858493624).

7821211976 is a wasteful number, since it uses less digits than its factorization.

7821211976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995548 (or 995544 counting only the distinct ones).

The product of its digits is 84672, while the sum is 44.

The square root of 7821211976 is about 88437.6162953299. The cubic root of 7821211976 is about 1984.9886089608.

The spelling of 7821211976 in words is "seven billion, eight hundred twenty-one million, two hundred eleven thousand, nine hundred seventy-six".