20121121120 has 96 divisors (see below), whose sum is σ = 51403621248. Its totient is φ = 7413792768.

The previous prime is 20121121067. The next prime is 20121121151. The reversal of 20121121120 is 2112112102.

It is a self number, because there is not a number n which added to its sum of digits gives 20121121120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49144 + ... + 206536.

It is an arithmetic number, because the mean of its divisors is an integer number (535454388).

Almost surely, 2^20121121120 is an apocalyptic number.

20121121120 is a gapful number since it is divisible by the number (20) 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 20121121120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25701810624).

20121121120 is an abundant number, since it is smaller than the sum of its proper divisors (31282500128).

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

20121121120 is a wasteful number, since it uses less digits than its factorization.

20121121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157472 (or 157464 counting only the distinct ones).

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

Adding to 20121121120 its reverse (2112112102), we get a palindrome (22233233222).

The spelling of 20121121120 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty".