51024545221 has 4 divisors (see below), whose sum is σ = 54949510252. Its totient is φ = 47099580192.

The previous prime is 51024545207. The next prime is 51024545251. The reversal of 51024545221 is 12254542015.

51024545221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18601140996 + 32423404225 = 136386^2 + 180065^2 .

It is a cyclic number.

It is not a de Polignac number, because 51024545221 - 2¹³ = 51024537029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51024545251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962482496 + ... + 1962482521.

It is an arithmetic number, because the mean of its divisors is an integer number (13737377563).

Almost surely, 2^51024545221 is an apocalyptic number.

It is an amenable number.

51024545221 is a deficient number, since it is larger than the sum of its proper divisors (3924965031).

51024545221 is a wasteful number, since it uses less digits than its factorization.

51024545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3924965030.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 51024545221 in words is "fifty-one billion, twenty-four million, five hundred forty-five thousand, two hundred twenty-one".