5121321013512 has 320 divisors, whose sum is σ = 16221642940800. Its totient is φ = 1495294940160.

The previous prime is 5121321013511. The next prime is 5121321013559. The reversal of 5121321013512 is 2153101231215.

5121321013512 is a `hidden beast` number, since 5 + 1 + 2 + 132 + 1 + 0 + 13 + 512 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (5121321013511) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 100643308 + ... + 100694180.

It is an arithmetic number, because the mean of its divisors is an integer number (50692634190).

Almost surely, 2^{5121321013512} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5121321013512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8110821470400).

5121321013512 is an abundant number, since it is smaller than the sum of its proper divisors (11100321927288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5121321013512 is a wasteful number, since it uses less digits than its factorization.

5121321013512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51418 (or 51405 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 5121321013512 its reverse (2153101231215), we get a palindrome (7274422244727).

The spelling of 5121321013512 in words is "five trillion, one hundred twenty-one billion, three hundred twenty-one million, thirteen thousand, five hundred twelve".