51073021321 has 16 divisors (see below), whose sum is σ = 59025528576. Its totient is φ = 43285441536.

The previous prime is 51073021303. The next prime is 51073021393. The reversal of 51073021321 is 12312037015.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51073021321 - 2⁹ = 51073020809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51073021301) 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 15 ways as a sum of consecutive naturals, for example, 710580 + ... + 779146.

It is an arithmetic number, because the mean of its divisors is an integer number (3689095536).

Almost surely, 2^51073021321 is an apocalyptic number.

It is an amenable number.

51073021321 is a deficient number, since it is larger than the sum of its proper divisors (7952507255).

51073021321 is a wasteful number, since it uses less digits than its factorization.

51073021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69768.

The product of its (nonzero) digits is 1260, while the sum is 25.

Adding to 51073021321 its reverse (12312037015), we get a palindrome (63385058336).

The spelling of 51073021321 in words is "fifty-one billion, seventy-three million, twenty-one thousand, three hundred twenty-one".