51021232321 has 8 divisors (see below), whose sum is σ = 51081507488. Its totient is φ = 50960988000.

The previous prime is 51021232313. The next prime is 51021232351. The reversal of 51021232321 is 12323212015.

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 51021232321 - 2³ = 51021232313 is a prime.

It is a super-2 number, since 2×51021232321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51021232292 and 51021232301.

It is not an unprimeable number, because it can be changed into a prime (51021232351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5195506 + ... + 5205316.

It is an arithmetic number, because the mean of its divisors is an integer number (6385188436).

Almost surely, 2^51021232321 is an apocalyptic number.

It is an amenable number.

51021232321 is a deficient number, since it is larger than the sum of its proper divisors (60275167).

51021232321 is a wasteful number, since it uses less digits than its factorization.

51021232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15423.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 51021232321 its reverse (12323212015), we get a palindrome (63344444336).

The spelling of 51021232321 in words is "fifty-one billion, twenty-one million, two hundred thirty-two thousand, three hundred twenty-one".