51939243821 has 8 divisors (see below), whose sum is σ = 52318860000. Its totient is φ = 51560041680.

The previous prime is 51939243781. The next prime is 51939243869. The reversal of 51939243821 is 12834293915.

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

It is a cyclic number.

It is not a de Polignac number, because 51939243821 - 2³⁰ = 50865501997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51939243871) 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, 150566 + ... + 355736.

It is an arithmetic number, because the mean of its divisors is an integer number (6539857500).

Almost surely, 2^51939243821 is an apocalyptic number.

It is an amenable number.

51939243821 is a deficient number, since it is larger than the sum of its proper divisors (379616179).

51939243821 is a wasteful number, since it uses less digits than its factorization.

51939243821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207019.

The product of its digits is 466560, while the sum is 47.

The spelling of 51939243821 in words is "fifty-one billion, nine hundred thirty-nine million, two hundred forty-three thousand, eight hundred twenty-one".