20111213112 has 128 divisors (see below), whose sum is σ = 53835632640. Its totient is φ = 6238679040.

The previous prime is 20111213099. The next prime is 20111213149. The reversal of 20111213112 is 21131211102.

It is a junction number, because it is equal to n+sod(n) for n = 20111213091 and 20111213100.

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, 18501033 + ... + 18502119.

It is an arithmetic number, because the mean of its divisors is an integer number (420590880).

Almost surely, 2^20111213112 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 20111213112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26917816320).

20111213112 is an abundant number, since it is smaller than the sum of its proper divisors (33724419528).

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

20111213112 is a wasteful number, since it uses less digits than its factorization.

20111213112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1577 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20111213112 its reverse (21131211102), we get a palindrome (41242424214).

The spelling of 20111213112 in words is "twenty billion, one hundred eleven million, two hundred thirteen thousand, one hundred twelve".