13121043434 has 4 divisors (see below), whose sum is σ = 19681565154. Its totient is φ = 6560521716.

The previous prime is 13121043431. The next prime is 13121043461. The reversal of 13121043434 is 43434012131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43434012131 = 133187 ⋅326113.

It can be written as a sum of positive squares in only one way, i.e., 8207454025 + 4913589409 = 90595^2 + 70097^2 .

It is a super-3 number, since 3×13121043434³ (a number of 31 digits) contains 333 as substring.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 3280260857 + ... + 3280260860.

Almost surely, 2^13121043434 is an apocalyptic number.

13121043434 is a deficient number, since it is larger than the sum of its proper divisors (6560521720).

13121043434 is an equidigital number, since it uses as much as digits as its factorization.

13121043434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560521719.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 13121043434 its reverse (43434012131), we get a palindrome (56555055565).

The spelling of 13121043434 in words is "thirteen billion, one hundred twenty-one million, forty-three thousand, four hundred thirty-four".