20121220220112 has 480 divisors, whose sum is σ = 64962265006080. Its totient is φ = 5754043975680.

The previous prime is 20121220220077. The next prime is 20121220220117. The reversal of 20121220220112 is 21102202212102.

It is a happy number.

20121220220112 is a `hidden beast` number, since 201 + 21 + 220 + 220 + 1 + 1 + 2 = 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 (20121220220117) 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 95 ways as a sum of consecutive naturals, for example, 7042777788 + ... + 7042780644.

It is an arithmetic number, because the mean of its divisors is an integer number (135338052096).

Almost surely, 2^{20121220220112} is an apocalyptic number.

20121220220112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121220220112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32481132503040).

20121220220112 is an abundant number, since it is smaller than the sum of its proper divisors (44841044785968).

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

20121220220112 is a wasteful number, since it uses less digits than its factorization.

20121220220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431 (or 5422 counting only the distinct ones).

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

Adding to 20121220220112 its reverse (21102202212102), we get a palindrome (41223422432214).

The spelling of 20121220220112 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, one hundred twelve".