21312301231312 has 120 divisors (see below), whose sum is σ = 51801134515200. Its totient is φ = 8419510810368.

The previous prime is 21312301231297. The next prime is 21312301231349. The reversal of 21312301231312 is 21313210321312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5873889 + ... + 8782207.

It is an arithmetic number, because the mean of its divisors is an integer number (431676120960).

Almost surely, 2^{21312301231312} 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 21312301231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25900567257600).

21312301231312 is an abundant number, since it is smaller than the sum of its proper divisors (30488833283888).

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

21312301231312 is a wasteful number, since it uses less digits than its factorization.

21312301231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909073 (or 2909060 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21312301231312 its reverse (21313210321312), we get a palindrome (42625511552624).

The spelling of 21312301231312 in words is "twenty-one trillion, three hundred twelve billion, three hundred one million, two hundred thirty-one thousand, three hundred twelve".