51425221 has 8 divisors (see below), whose sum is σ = 54881280. Its totient is φ = 48017088.

The previous prime is 51425203. The next prime is 51425237. The reversal of 51425221 is 12252415.

51425221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51425221 - 2⁷ = 51425093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51425192 and 51425201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51425321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9751 + ... + 14068.

It is an arithmetic number, because the mean of its divisors is an integer number (6860160).

Almost surely, 2^51425221 is an apocalyptic number.

It is an amenable number.

51425221 is a deficient number, since it is larger than the sum of its proper divisors (3456059).

51425221 is a wasteful number, since it uses less digits than its factorization.

51425221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23963.

The product of its digits is 800, while the sum is 22.

The square root of 51425221 is about 7171.1380547302. The cubic root of 51425221 is about 371.8707807444.

Adding to 51425221 its reverse (12252415), we get a palindrome (63677636).

The spelling of 51425221 in words is "fifty-one million, four hundred twenty-five thousand, two hundred twenty-one".