51055506021 has 16 divisors (see below), whose sum is σ = 73325127680. Its totient is φ = 31412491200.

The previous prime is 51055506013. The next prime is 51055506023. The reversal of 51055506021 is 12060555015.

51055506021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51055506021 - 2³ = 51055506013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51055506021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51055506023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70620 + ... + 327258.

It is an arithmetic number, because the mean of its divisors is an integer number (4582820480).

Almost surely, 2^51055506021 is an apocalyptic number.

It is an amenable number.

51055506021 is a deficient number, since it is larger than the sum of its proper divisors (22269621659).

51055506021 is a wasteful number, since it uses less digits than its factorization.

51055506021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261756.

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 51055506021 in words is "fifty-one billion, fifty-five million, five hundred six thousand, twenty-one".