20101111212 has 192 divisors, whose sum is σ = 59464832000. Its totient is φ = 5142610944.

The previous prime is 20101111183. The next prime is 20101111213. The reversal of 20101111212 is 21211110102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (20101111213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20161098 + ... + 20162094.

Almost surely, 2^20101111212 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 20101111212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29732416000).

20101111212 is an abundant number, since it is smaller than the sum of its proper divisors (39363720788).

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

20101111212 is a wasteful number, since it uses less digits than its factorization.

20101111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20101111212 its reverse (21211110102), we get a palindrome (41312221314).

The spelling of 20101111212 in words is "twenty billion, one hundred one million, one hundred eleven thousand, two hundred twelve".