51021203111 has 8 divisors (see below), whose sum is σ = 52112904384. Its totient is φ = 49929757920.

The previous prime is 51021203069. The next prime is 51021203141. The reversal of 51021203111 is 11130212015.

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 51021203111 - 2³⁰ = 49947461287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51021203111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021203141) 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 7 ways as a sum of consecutive naturals, for example, 369821 + ... + 488681.

It is an arithmetic number, because the mean of its divisors is an integer number (6514113048).

Almost surely, 2^51021203111 is an apocalyptic number.

51021203111 is a deficient number, since it is larger than the sum of its proper divisors (1091701273).

51021203111 is a wasteful number, since it uses less digits than its factorization.

51021203111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128041.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 51021203111 its reverse (11130212015), we get a palindrome (62151415126).

The spelling of 51021203111 in words is "fifty-one billion, twenty-one million, two hundred three thousand, one hundred eleven".