51425015221 has 12 divisors (see below), whose sum is σ = 53857764940. Its totient is φ = 49097949120.

The previous prime is 51425015209. The next prime is 51425015227. The reversal of 51425015221 is 12251052415.

It can be written as a sum of positive squares in 2 ways, for example, as 29109136996 + 22315878225 = 170614^2 + 149385^2 .

It is not a de Polignac number, because 51425015221 - 2⁵ = 51425015189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51425015221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51425015227) 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, 196345 + ... + 376033.

Almost surely, 2^51425015221 is an apocalyptic number.

It is an amenable number.

51425015221 is a deficient number, since it is larger than the sum of its proper divisors (2432749719).

51425015221 is a wasteful number, since it uses less digits than its factorization.

51425015221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180276 (or 180253 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 51425015221 its reverse (12251052415), we get a palindrome (63676067636).

The spelling of 51425015221 in words is "fifty-one billion, four hundred twenty-five million, fifteen thousand, two hundred twenty-one".