51242321 has 12 divisors (see below), whose sum is σ = 57904128. Its totient is φ = 45240624.

The previous prime is 51242311. The next prime is 51242339. The reversal of 51242321 is 12324215.

51242321 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 51242321 - 2¹⁰ = 51241297 is a prime.

It is a super-2 number, since 2×51242321² = 5251550922934082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51242293 and 51242302.

It is not an unprimeable number, because it can be changed into a prime (51242311) 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 11 ways as a sum of consecutive naturals, for example, 2705 + ... + 10478.

It is an arithmetic number, because the mean of its divisors is an integer number (4825344).

Almost surely, 2^51242321 is an apocalyptic number.

It is an amenable number.

51242321 is a deficient number, since it is larger than the sum of its proper divisors (6661807).

51242321 is a wasteful number, since it uses less digits than its factorization.

51242321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13232 (or 13219 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 51242321 is about 7158.3741869226. The cubic root of 51242321 is about 371.4293892839.

Adding to 51242321 its reverse (12324215), we get a palindrome (63566536).

The spelling of 51242321 in words is "fifty-one million, two hundred forty-two thousand, three hundred twenty-one".