20011222121112 has 160 divisors (see below), whose sum is σ = 56831679590400. Its totient is φ = 6577590142656.

The previous prime is 20011222121089. The next prime is 20011222121147. The reversal of 20011222121112 is 21112122211002.

20011222121112 is a `hidden beast` number, since 200 + 11 + 222 + 121 + 112 = 666.

It is a super-2 number, since 2×20011222121112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 40039753 + ... + 40536455.

It is an arithmetic number, because the mean of its divisors is an integer number (355197997440).

Almost surely, 2^{20011222121112} 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 20011222121112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28415839795200).

20011222121112 is an abundant number, since it is smaller than the sum of its proper divisors (36820457469288).

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

20011222121112 is a wasteful number, since it uses less digits than its factorization.

20011222121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497587 (or 497574 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20011222121112 its reverse (21112122211002), we get a palindrome (41123344332114).

The spelling of 20011222121112 in words is "twenty trillion, eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twelve".