20121211120104 has 96 divisors (see below), whose sum is σ = 55793490873120. Its totient is φ = 6547424220288.

The previous prime is 20121211120037. The next prime is 20121211120111. The reversal of 20121211120104 is 40102111212102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3714114 + ... + 7350990.

It is an arithmetic number, because the mean of its divisors is an integer number (581182196595).

Almost surely, 2^{20121211120104} is an apocalyptic number.

20121211120104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121211120104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27896745436560).

20121211120104 is an abundant number, since it is smaller than the sum of its proper divisors (35672279753016).

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

20121211120104 is a wasteful number, since it uses less digits than its factorization.

20121211120104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638719 (or 3638712 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20121211120104 its reverse (40102111212102), we get a palindrome (60223322332206).

The spelling of 20121211120104 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred four".