20012122122112 has 64 divisors (see below), whose sum is σ = 40098306646800. Its totient is φ = 9948254838784.

The previous prime is 20012122122073. The next prime is 20012122122119. The reversal of 20012122122112 is 21122122121002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 20012122122112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012122122119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123483438 + ... + 123645394.

Almost surely, 2^{20012122122112} 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 20012122122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20049153323400).

20012122122112 is an abundant number, since it is smaller than the sum of its proper divisors (20086184524688).

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

20012122122112 is a wasteful number, since it uses less digits than its factorization.

20012122122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167543 (or 167531 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20012122122112 its reverse (21122122121002), we get a palindrome (41134244243114).

The spelling of 20012122122112 in words is "twenty trillion, twelve billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred twelve".