13442336521 has 4 divisors (see below), whose sum is σ = 13593374100. Its totient is φ = 13291298944.

The previous prime is 13442336513. The next prime is 13442336539. The reversal of 13442336521 is 12563324431.

It is a happy number.

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 8206366921 + 5235969600 = 90589^2 + 72360^2 .

It is a cyclic number.

It is not a de Polignac number, because 13442336521 - 2³ = 13442336513 is a prime.

It is a super-2 number, since 2×13442336521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13442336321) 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, 75518656 + ... + 75518833.

It is an arithmetic number, because the mean of its divisors is an integer number (3398343525).

Almost surely, 2^13442336521 is an apocalyptic number.

It is an amenable number.

13442336521 is a deficient number, since it is larger than the sum of its proper divisors (151037579).

13442336521 is an equidigital number, since it uses as much as digits as its factorization.

13442336521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151037578.

The product of its digits is 51840, while the sum is 34.

The spelling of 13442336521 in words is "thirteen billion, four hundred forty-two million, three hundred thirty-six thousand, five hundred twenty-one".