20112311121 has 24 divisors (see below), whose sum is σ = 31366992384. Its totient is φ = 11429238240.

The previous prime is 20112311119. The next prime is 20112311137. The reversal of 20112311121 is 12111321102.

It is not a de Polignac number, because 20112311121 - 2¹ = 20112311119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20112311121.

It is not an unprimeable number, because it can be changed into a prime (20112315121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351345 + ... + 404558.

It is an arithmetic number, because the mean of its divisors is an integer number (1306958016).

Almost surely, 2^20112311121 is an apocalyptic number.

20112311121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20112311121 is a deficient number, since it is larger than the sum of its proper divisors (11254681263).

20112311121 is a wasteful number, since it uses less digits than its factorization.

20112311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756101 (or 756094 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20112311121 its reverse (12111321102), we get a palindrome (32223632223).

It can be divided in two parts, 2011 and 2311121, that added together give a palindrome (2313132).

The spelling of 20112311121 in words is "twenty billion, one hundred twelve million, three hundred eleven thousand, one hundred twenty-one".