13434056521 has 4 divisors (see below), whose sum is σ = 13437051012. Its totient is φ = 13431062032.

The previous prime is 13434056509. The next prime is 13434056551. The reversal of 13434056521 is 12565043431.

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 12009748921 + 1424307600 = 109589^2 + 37740^2 .

It is a cyclic number.

It is not a de Polignac number, because 13434056521 - 2⁷ = 13434056393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13434056501) 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, 1490506 + ... + 1499491.

It is an arithmetic number, because the mean of its divisors is an integer number (3359262753).

Almost surely, 2^13434056521 is an apocalyptic number.

It is an amenable number.

13434056521 is a deficient number, since it is larger than the sum of its proper divisors (2994491).

13434056521 is an equidigital number, since it uses as much as digits as its factorization.

13434056521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994490.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 13434056521 its reverse (12565043431), we get a palindrome (25999099952).

The spelling of 13434056521 in words is "thirteen billion, four hundred thirty-four million, fifty-six thousand, five hundred twenty-one".