20121211113 has 4 divisors (see below), whose sum is σ = 26828281488. Its totient is φ = 13414140740.

The previous prime is 20121211087. The next prime is 20121211139. The reversal of 20121211113 is 31111212102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20121211087) and next prime (20121211139).

It is a cyclic number.

It is not a de Polignac number, because 20121211113 - 2⁵ = 20121211081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121211092 and 20121211101.

It is not an unprimeable number, because it can be changed into a prime (20121211613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353535183 + ... + 3353535188.

It is an arithmetic number, because the mean of its divisors is an integer number (6707070372).

Almost surely, 2^20121211113 is an apocalyptic number.

It is an amenable number.

20121211113 is a deficient number, since it is larger than the sum of its proper divisors (6707070375).

20121211113 is an equidigital number, since it uses as much as digits as its factorization.

20121211113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707070374.

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

Adding to 20121211113 its reverse (31111212102), we get a palindrome (51232423215).

The spelling of 20121211113 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, one hundred thirteen".