51079377221 has 4 divisors (see below), whose sum is σ = 51302431500. Its totient is φ = 50856322944.

The previous prime is 51079377211. The next prime is 51079377253. The reversal of 51079377221 is 12277397015.

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 35762592100 + 15316785121 = 189110^2 + 123761^2 .

It is a cyclic number.

It is not a de Polignac number, because 51079377221 - 2¹⁴ = 51079360837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51079377211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111526796 + ... + 111527253.

It is an arithmetic number, because the mean of its divisors is an integer number (12825607875).

Almost surely, 2^51079377221 is an apocalyptic number.

It is an amenable number.

51079377221 is a deficient number, since it is larger than the sum of its proper divisors (223054279).

51079377221 is a wasteful number, since it uses less digits than its factorization.

51079377221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223054278.

The product of its (nonzero) digits is 185220, while the sum is 44.

The spelling of 51079377221 in words is "fifty-one billion, seventy-nine million, three hundred seventy-seven thousand, two hundred twenty-one".