51721933388 has 12 divisors (see below), whose sum is σ = 90615896280. Its totient is φ = 25831677312.

The previous prime is 51721933327. The next prime is 51721933541. The reversal of 51721933388 is 88333912715.

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, 7318373 + ... + 7325436.

It is an arithmetic number, because the mean of its divisors is an integer number (7551324690).

Almost surely, 2^51721933388 is an apocalyptic number.

It is an amenable number.

51721933388 is a deficient number, since it is larger than the sum of its proper divisors (38893962892).

51721933388 is a wasteful number, since it uses less digits than its factorization.

51721933388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14644696 (or 14644694 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The spelling of 51721933388 in words is "fifty-one billion, seven hundred twenty-one million, nine hundred thirty-three thousand, three hundred eighty-eight".