20121210012 has 48 divisors (see below), whose sum is σ = 48708696960. Its totient is φ = 6457090752.

The previous prime is 20121209993. The next prime is 20121210017. The reversal of 20121210012 is 21001212102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20121210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121210017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37443 + ... + 204069.

It is an arithmetic number, because the mean of its divisors is an integer number (1014764520).

Almost surely, 2^20121210012 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 20121210012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24354348480).

20121210012 is an abundant number, since it is smaller than the sum of its proper divisors (28587486948).

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

20121210012 is a wasteful number, since it uses less digits than its factorization.

20121210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167010 (or 167008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121210012 its reverse (21001212102), we get a palindrome (41122422114).

The spelling of 20121210012 in words is "twenty billion, one hundred twenty-one million, two hundred ten thousand, twelve".