20113240121 has 8 divisors (see below), whose sum is σ = 21667587144. Its totient is φ = 18559918080.

The previous prime is 20113240109. The next prime is 20113240157. The reversal of 20113240121 is 12104231102.

It can be written as a sum of positive squares in 4 ways, for example, as 4101121600 + 16012118521 = 64040^2 + 126539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20113240121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20113240121.

It is not an unprimeable number, because it can be changed into a prime (20113240171) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 215240 + ... + 294201.

It is an arithmetic number, because the mean of its divisors is an integer number (2708448393).

Almost surely, 2^20113240121 is an apocalyptic number.

It is an amenable number.

20113240121 is a deficient number, since it is larger than the sum of its proper divisors (1554347023).

20113240121 is a wasteful number, since it uses less digits than its factorization.

20113240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512491.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20113240121 its reverse (12104231102), we get a palindrome (32217471223).

The spelling of 20113240121 in words is "twenty billion, one hundred thirteen million, two hundred forty thousand, one hundred twenty-one".