20113212121312 has 96 divisors (see below), whose sum is σ = 41962676071680. Its totient is φ = 9463237908480.

The previous prime is 20113212121273. The next prime is 20113212121363. The reversal of 20113212121312 is 21312121231102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138117723 + ... + 138263269.

It is an arithmetic number, because the mean of its divisors is an integer number (437111209080).

Almost surely, 2^{20113212121312} 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 20113212121312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20981338035840).

20113212121312 is an abundant number, since it is smaller than the sum of its proper divisors (21849463950368).

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

20113212121312 is a wasteful number, since it uses less digits than its factorization.

20113212121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147104 (or 147096 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 20113212121312 its reverse (21312121231102), we get a palindrome (41425333352414).

The spelling of 20113212121312 in words is "twenty trillion, one hundred thirteen billion, two hundred twelve million, one hundred twenty-one thousand, three hundred twelve".