51211120 has 20 divisors (see below), whose sum is σ = 119066040. Its totient is φ = 20484416.

The previous prime is 51211117. The next prime is 51211159. The reversal of 51211120 is 2111215.

51211120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 51211120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319990 + ... + 320149.

It is an arithmetic number, because the mean of its divisors is an integer number (5953302).

Almost surely, 2^51211120 is an apocalyptic number.

It is an amenable number.

51211120 is an abundant number, since it is smaller than the sum of its proper divisors (67854920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51211120 is a wasteful number, since it uses less digits than its factorization.

51211120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640152 (or 640146 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 51211120 is about 7156.1945194356. The cubic root of 51211120 is about 371.3539872784.

Adding to 51211120 its reverse (2111215), we get a palindrome (53322335).

It can be divided in two parts, 5121 and 1120, that added together give a square (6241 = 79²).

The spelling of 51211120 in words is "fifty-one million, two hundred eleven thousand, one hundred twenty".