13121043436 has 12 divisors (see below), whose sum is σ = 22991007928. Its totient is φ = 6552184032.

The previous prime is 13121043431. The next prime is 13121043461. The reversal of 13121043436 is 63434012131.

It is not an unprimeable number, because it can be changed into a prime (13121043431) 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, 2080881 + ... + 2087176.

Almost surely, 2^13121043436 is an apocalyptic number.

It is an amenable number.

13121043436 is a deficient number, since it is larger than the sum of its proper divisors (9869964492).

13121043436 is a wasteful number, since it uses less digits than its factorization.

13121043436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168848 (or 4168846 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 13121043436 its reverse (63434012131), we get a palindrome (76555055567).

The spelling of 13121043436 in words is "thirteen billion, one hundred twenty-one million, forty-three thousand, four hundred thirty-six".