20013121212 has 96 divisors (see below), whose sum is σ = 55725304320. Its totient is φ = 5469192960.

The previous prime is 20013121207. The next prime is 20013121213. The reversal of 20013121212 is 21212131002.

It is a junction number, because it is equal to n+sod(n) for n = 20013121191 and 20013121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013121213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222262 + ... + 299042.

It is an arithmetic number, because the mean of its divisors is an integer number (580471920).

Almost surely, 2^20013121212 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 20013121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27862652160).

20013121212 is an abundant number, since it is smaller than the sum of its proper divisors (35712183108).

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

20013121212 is a wasteful number, since it uses less digits than its factorization.

20013121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76931 (or 76929 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20013121212 its reverse (21212131002), we get a palindrome (41225252214).

It can be divided in two parts, 2001 and 3121212, that added together give a palindrome (3123213).

The spelling of 20013121212 in words is "twenty billion, thirteen million, one hundred twenty-one thousand, two hundred twelve".