20012221122012 has 144 divisors (see below), whose sum is σ = 57922700838912. Its totient is φ = 5706943482240.

The previous prime is 20012221122001. The next prime is 20012221122017. The reversal of 20012221122012 is 21022112221002.

It is a happy number.

20012221122012 is a `hidden beast` number, since 200 + 1 + 22 + 211 + 220 + 12 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012221122017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 419422837 + ... + 419470547.

It is an arithmetic number, because the mean of its divisors is an integer number (402240978048).

Almost surely, 2^{20012221122012} 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 20012221122012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28961350419456).

20012221122012 is an abundant number, since it is smaller than the sum of its proper divisors (37910479716900).

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

20012221122012 is a wasteful number, since it uses less digits than its factorization.

20012221122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50848 (or 50843 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20012221122012 its reverse (21022112221002), we get a palindrome (41034333343014).

The spelling of 20012221122012 in words is "twenty trillion, twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, twelve".