7921220812 has 12 divisors (see below), whose sum is σ = 14309302336. Its totient is φ = 3832848720.

The previous prime is 7921220803. The next prime is 7921220837. The reversal of 7921220812 is 2180221297.

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, 31940283 + ... + 31940530.

Almost surely, 2^7921220812 is an apocalyptic number.

It is an amenable number.

7921220812 is a deficient number, since it is larger than the sum of its proper divisors (6388081524).

7921220812 is a wasteful number, since it uses less digits than its factorization.

7921220812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63880848 (or 63880846 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 7921220812 is about 89001.2405082086. The cubic root of 7921220812 is about 1993.4133998281.

The spelling of 7921220812 in words is "seven billion, nine hundred twenty-one million, two hundred twenty thousand, eight hundred twelve".