51002321 has 4 divisors (see below), whose sum is σ = 51648000. Its totient is φ = 50356644.

The previous prime is 51002269. The next prime is 51002323. The reversal of 51002321 is 12320015.

It is a happy number.

51002321 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12320015 = 5 ⋅2464003.

It is a cyclic number.

It is not a de Polignac number, because 51002321 - 2¹⁰ = 51001297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51002296 and 51002305.

It is not an unprimeable number, because it can be changed into a prime (51002323) 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 3 ways as a sum of consecutive naturals, for example, 322721 + ... + 322878.

It is an arithmetic number, because the mean of its divisors is an integer number (12912000).

Almost surely, 2^51002321 is an apocalyptic number.

It is an amenable number.

51002321 is a deficient number, since it is larger than the sum of its proper divisors (645679).

51002321 is an equidigital number, since it uses as much as digits as its factorization.

51002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645678.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 51002321 is about 7141.5909291978. The cubic root of 51002321 is about 370.8486025050.

Adding to 51002321 its reverse (12320015), we get a palindrome (63322336).

The spelling of 51002321 in words is "fifty-one million, two thousand, three hundred twenty-one".