12135244411021 has 4 divisors (see below), whose sum is σ = 12174015160252. Its totient is φ = 12096473661792.

The previous prime is 12135244410977. The next prime is 12135244411079. The reversal of 12135244411021 is 12011444253121.

12135244411021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232433908996 + 11902810502025 = 482114^2 + 3450045^2 .

It is a cyclic number.

It is not a de Polignac number, because 12135244411021 - 2³³ = 12126654476429 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 (12135244412021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19385374146 + ... + 19385374771.

It is an arithmetic number, because the mean of its divisors is an integer number (3043503790063).

Almost surely, 2^{12135244411021} is an apocalyptic number.

It is an amenable number.

12135244411021 is a deficient number, since it is larger than the sum of its proper divisors (38770749231).

12135244411021 is an equidigital number, since it uses as much as digits as its factorization.

12135244411021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38770749230.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 12135244411021 its reverse (12011444253121), we get a palindrome (24146688664142).

The spelling of 12135244411021 in words is "twelve trillion, one hundred thirty-five billion, two hundred forty-four million, four hundred eleven thousand, twenty-one".