30312121312 has 192 divisors, whose sum is σ = 68706247680. Its totient is φ = 13042483200.

The previous prime is 30312121289. The next prime is 30312121321. The reversal of 30312121312 is 21312121303.

It is a self number, because there is not a number n which added to its sum of digits gives 30312121312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82594153 + ... + 82594519.

It is an arithmetic number, because the mean of its divisors is an integer number (357845040).

Almost surely, 2^30312121312 is an apocalyptic number.

30312121312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30312121312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34353123840).

30312121312 is an abundant number, since it is smaller than the sum of its proper divisors (38394126368).

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

30312121312 is a wasteful number, since it uses less digits than its factorization.

30312121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 30312121312 its reverse (21312121303), we get a palindrome (51624242615).

Subtracting from 30312121312 its reverse (21312121303), we obtain a palindrome (9000000009).

The spelling of 30312121312 in words is "thirty billion, three hundred twelve million, one hundred twenty-one thousand, three hundred twelve".