20021200122012 has 96 divisors (see below), whose sum is σ = 49836721919040. Its totient is φ = 6233870254080.

The previous prime is 20021200121977. The next prime is 20021200122019. The reversal of 20021200122012 is 21022100212002.

It is a junction number, because it is equal to n+sod(n) for n = 20021200121982 and 20021200122000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021200122019) 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 31 ways as a sum of consecutive naturals, for example, 124036414 + ... + 124197722.

It is an arithmetic number, because the mean of its divisors is an integer number (519132519990).

Almost surely, 2^{20021200122012} 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 20021200122012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24918360959520).

20021200122012 is an abundant number, since it is smaller than the sum of its proper divisors (29815521797028).

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

20021200122012 is a wasteful number, since it uses less digits than its factorization.

20021200122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165911 (or 165909 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021200122012 its reverse (21022100212002), we get a palindrome (41043300334014).

The spelling of 20021200122012 in words is "twenty trillion, twenty-one billion, two hundred million, one hundred twenty-two thousand, twelve".