51339654921 has 16 divisors (see below), whose sum is σ = 69261598784. Its totient is φ = 33823125504.

The previous prime is 51339654889. The next prime is 51339654983. The reversal of 51339654921 is 12945693315.

It is not a de Polignac number, because 51339654921 - 2⁵ = 51339654889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51339655921) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 64770 + ... + 326916.

It is an arithmetic number, because the mean of its divisors is an integer number (4328849924).

Almost surely, 2^51339654921 is an apocalyptic number.

It is an amenable number.

51339654921 is a deficient number, since it is larger than the sum of its proper divisors (17921943863).

51339654921 is a wasteful number, since it uses less digits than its factorization.

51339654921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262920.

The product of its digits is 874800, while the sum is 48.

The spelling of 51339654921 in words is "fifty-one billion, three hundred thirty-nine million, six hundred fifty-four thousand, nine hundred twenty-one".