20010121212112 has 80 divisors (see below), whose sum is σ = 40612975603200. Its totient is φ = 9538365957120.

The previous prime is 20010121212077. The next prime is 20010121212161. The reversal of 20010121212112 is 21121212101002.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 29688937 + ... + 30355447.

It is an arithmetic number, because the mean of its divisors is an integer number (507662195040).

Almost surely, 2^{20010121212112} 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 20010121212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20306487801600).

20010121212112 is an abundant number, since it is smaller than the sum of its proper divisors (20602854391088).

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

20010121212112 is a wasteful number, since it uses less digits than its factorization.

20010121212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667364 (or 667358 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20010121212112 its reverse (21121212101002), we get a palindrome (41131333313114).

The spelling of 20010121212112 in words is "twenty trillion, ten billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twelve".