51530331021 has 16 divisors (see below), whose sum is σ = 73996359360. Its totient is φ = 31709220480.

The previous prime is 51530331007. The next prime is 51530331029. The reversal of 51530331021 is 12013303515.

It is not a de Polignac number, because 51530331021 - 2¹¹ = 51530328973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51530330982 and 51530331000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530331029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1270585 + ... + 1310513.

It is an arithmetic number, because the mean of its divisors is an integer number (4624772460).

Almost surely, 2^51530331021 is an apocalyptic number.

It is an amenable number.

51530331021 is a deficient number, since it is larger than the sum of its proper divisors (22466028339).

51530331021 is a wasteful number, since it uses less digits than its factorization.

51530331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73036.

The product of its (nonzero) digits is 1350, while the sum is 24.

Adding to 51530331021 its reverse (12013303515), we get a palindrome (63543634536).

The spelling of 51530331021 in words is "fifty-one billion, five hundred thirty million, three hundred thirty-one thousand, twenty-one".