51021203113 has 8 divisors (see below), whose sum is σ = 51243071688. Its totient is φ = 50799606144.

The previous prime is 51021203069. The next prime is 51021203141. The reversal of 51021203113 is 31130212015.

51021203113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11057994649 + 39963208464 = 105157^2 + 199908^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51021203113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51021233113) 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, 313245 + ... + 447397.

It is an arithmetic number, because the mean of its divisors is an integer number (6405383961).

Almost surely, 2^51021203113 is an apocalyptic number.

It is an amenable number.

51021203113 is a deficient number, since it is larger than the sum of its proper divisors (221868575).

51021203113 is a wasteful number, since it uses less digits than its factorization.

51021203113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135803.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 51021203113 its reverse (31130212015), we get a palindrome (82151415128).

The spelling of 51021203113 in words is "fifty-one billion, twenty-one million, two hundred three thousand, one hundred thirteen".