12636435121 has 6 divisors (see below), whose sum is σ = 13423479830. Its totient is φ = 11893115136.

The previous prime is 12636435079. The next prime is 12636435131. The reversal of 12636435121 is 12153463621.

It can be written as a sum of positive squares in 3 ways, for example, as 1792336896 + 10844098225 = 42336^2 + 104135^2 .

It is not a de Polignac number, because 12636435121 - 2¹⁷ = 12636304049 is a prime.

It is a super-3 number, since 3×12636435121³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12636435131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21862056 + ... + 21862633.

Almost surely, 2^12636435121 is an apocalyptic number.

It is an amenable number.

12636435121 is a deficient number, since it is larger than the sum of its proper divisors (787044709).

12636435121 is an equidigital number, since it uses as much as digits as its factorization.

12636435121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43724723 (or 43724706 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

Adding to 12636435121 its reverse (12153463621), we get a palindrome (24789898742).

The spelling of 12636435121 in words is "twelve billion, six hundred thirty-six million, four hundred thirty-five thousand, one hundred twenty-one".