20011002121012 has 144 divisors (see below), whose sum is σ = 44278174778880. Its totient is φ = 7860154982400.

The previous prime is 20011002121009. The next prime is 20011002121021. The reversal of 20011002121012 is 21012120011002.

It is a junction number, because it is equal to n+sod(n) for n = 20011002120983 and 20011002121001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 382439812 + ... + 382492132.

Almost surely, 2^{20011002121012} 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 20011002121012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22139087389440).

20011002121012 is an abundant number, since it is smaller than the sum of its proper divisors (24267172657868).

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

20011002121012 is a wasteful number, since it uses less digits than its factorization.

20011002121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55702 (or 55693 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011002121012 its reverse (21012120011002), we get a palindrome (41023122132014).

The spelling of 20011002121012 in words is "twenty trillion, eleven billion, two million, one hundred twenty-one thousand, twelve".