51086120021388 has 36 divisors (see below), whose sum is σ = 132624476755680. Its totient is φ = 16568471357856.

The previous prime is 51086120021381. The next prime is 51086120021393. The reversal of 51086120021388 is 88312002168015.

51086120021388 is a `hidden beast` number, since 5 + 1 + 0 + 8 + 61 + 200 + 2 + 1 + 388 = 666.

51086120021388 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 (36).

It is a super-4 number, since 4×51086120021388⁴ (a number of 56 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (51086120021381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19176470148 + ... + 19176472811.

Almost surely, 2^{51086120021388} is an apocalyptic number.

It is an amenable number.

51086120021388 is an abundant number, since it is smaller than the sum of its proper divisors (81538356734292).

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

51086120021388 is a wasteful number, since it uses less digits than its factorization.

51086120021388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38352943006 (or 38352943001 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 51086120021388 in words is "fifty-one trillion, eighty-six billion, one hundred twenty million, twenty-one thousand, three hundred eighty-eight".