13523426621 has 4 divisors (see below), whose sum is σ = 13620717600. Its totient is φ = 13426135644.

The previous prime is 13523426603. The next prime is 13523426641. The reversal of 13523426621 is 12662432531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12662432531 = 7 ⋅1808918933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13523426621 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 (13523426641) 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, 48645281 + ... + 48645558.

It is an arithmetic number, because the mean of its divisors is an integer number (3405179400).

Almost surely, 2^13523426621 is an apocalyptic number.

It is an amenable number.

13523426621 is a deficient number, since it is larger than the sum of its proper divisors (97290979).

13523426621 is an equidigital number, since it uses as much as digits as its factorization.

13523426621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97290978.

The product of its digits is 51840, while the sum is 35.

The spelling of 13523426621 in words is "thirteen billion, five hundred twenty-three million, four hundred twenty-six thousand, six hundred twenty-one".