20121131110044 has 12 divisors (see below), whose sum is σ = 46949305923464. Its totient is φ = 6707043703344.

The previous prime is 20121131109977. The next prime is 20121131110049. The reversal of 20121131110044 is 44001113112102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20121131110044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121131110049) 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 3 ways as a sum of consecutive naturals, for example, 838380462907 + ... + 838380462930.

Almost surely, 2^{20121131110044} is an apocalyptic number.

It is an amenable number.

20121131110044 is an abundant number, since it is smaller than the sum of its proper divisors (26828174813420).

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

20121131110044 is a wasteful number, since it uses less digits than its factorization.

20121131110044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676760925844 (or 1676760925842 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 20121131110044 its reverse (44001113112102), we get a palindrome (64122244222146).

The spelling of 20121131110044 in words is "twenty trillion, one hundred twenty-one billion, one hundred thirty-one million, one hundred ten thousand, forty-four".