2121012231312 has 160 divisors (see below), whose sum is σ = 6014146320000. Its totient is φ = 640087658496.

The previous prime is 2121012231257. The next prime is 2121012231343. The reversal of 2121012231312 is 2131322101212.

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, 115709764 + ... + 115728092.

It is an arithmetic number, because the mean of its divisors is an integer number (37588414500).

Almost surely, 2^{2121012231312} 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 2121012231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3007073160000).

2121012231312 is an abundant number, since it is smaller than the sum of its proper divisors (3893134088688).

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

2121012231312 is a wasteful number, since it uses less digits than its factorization.

2121012231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21905 (or 21899 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2121012231312 its reverse (2131322101212), we get a palindrome (4252334332524).

The spelling of 2121012231312 in words is "two trillion, one hundred twenty-one billion, twelve million, two hundred thirty-one thousand, three hundred twelve".