13521420021343 has 4 divisors (see below), whose sum is σ = 14561529253768. Its totient is φ = 12481310788920.

The previous prime is 13521420021331. The next prime is 13521420021413. The reversal of 13521420021343 is 34312002412531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13521420021343 - 2²⁵ = 13521386466911 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 (13521420021313) 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, 520054616193 + ... + 520054616218.

It is an arithmetic number, because the mean of its divisors is an integer number (3640382313442).

Almost surely, 2^{13521420021343} is an apocalyptic number.

13521420021343 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13521420021343 is a deficient number, since it is larger than the sum of its proper divisors (1040109232425).

13521420021343 is a wasteful number, since it uses less digits than its factorization.

13521420021343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040109232424.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 13521420021343 its reverse (34312002412531), we get a palindrome (47833422433874).

The spelling of 13521420021343 in words is "thirteen trillion, five hundred twenty-one billion, four hundred twenty million, twenty-one thousand, three hundred forty-three".