12121112111021 has 12 divisors (see below), whose sum is σ = 12243992901660. Its totient is φ = 11999452273920.

The previous prime is 12121112110999. The next prime is 12121112111041. The reversal of 12121112111021 is 12011121112121.

12121112111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11361449955625 + 759662155396 = 3370675^2 + 871586^2 .

It is not a de Polignac number, because 12121112111021 - 2⁶ = 12121112110957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121112111041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32074115 + ... + 32449823.

It is an arithmetic number, because the mean of its divisors is an integer number (1020332741805).

Almost surely, 2^{12121112111021} is an apocalyptic number.

It is an amenable number.

12121112111021 is a deficient number, since it is larger than the sum of its proper divisors (122880790639).

12121112111021 is an equidigital number, since it uses as much as digits as its factorization.

12121112111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378956 (or 378853 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12121112111021 its reverse (12011121112121), we get a palindrome (24132233223142).

The spelling of 12121112111021 in words is "twelve trillion, one hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, twenty-one".