51221434013 has 8 divisors (see below), whose sum is σ = 53510774016. Its totient is φ = 48971908800.

The previous prime is 51221433971. The next prime is 51221434021. The reversal of 51221434013 is 31043412215.

It is a happy number.

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 51221434013 - 2¹⁰ = 51221432989 is a prime.

It is a super-3 number, since 3×51221434013³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221433013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9951068 + ... + 9956213.

It is an arithmetic number, because the mean of its divisors is an integer number (6688846752).

Almost surely, 2^51221434013 is an apocalyptic number.

It is an amenable number.

51221434013 is a deficient number, since it is larger than the sum of its proper divisors (2289340003).

51221434013 is a wasteful number, since it uses less digits than its factorization.

51221434013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19907395.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 51221434013 its reverse (31043412215), we get a palindrome (82264846228).

The spelling of 51221434013 in words is "fifty-one billion, two hundred twenty-one million, four hundred thirty-four thousand, thirteen".