20111171344512 has 256 divisors, whose sum is σ = 54984099110400. Its totient is φ = 6510403141632.

The previous prime is 20111171344487. The next prime is 20111171344531. The reversal of 20111171344512 is 21544317111102.

It is a happy 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, 806272713 + ... + 806297655.

It is an arithmetic number, because the mean of its divisors is an integer number (214781637150).

Almost surely, 2^{20111171344512} 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 20111171344512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27492049555200).

20111171344512 is an abundant number, since it is smaller than the sum of its proper divisors (34872927765888).

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

20111171344512 is a wasteful number, since it uses less digits than its factorization.

20111171344512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25415 (or 25403 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

Adding to 20111171344512 its reverse (21544317111102), we get a palindrome (41655488455614).

The spelling of 20111171344512 in words is "twenty trillion, one hundred eleven billion, one hundred seventy-one million, three hundred forty-four thousand, five hundred twelve".