21513532425343 has 4 divisors (see below), whose sum is σ = 24586894200400. Its totient is φ = 18440170650288.

The previous prime is 21513532425331. The next prime is 21513532425361. The reversal of 21513532425343 is 34352423531512.

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 21513532425343 - 2³⁷ = 21376093471871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21513532425343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513532425323) 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, 1536680887518 + ... + 1536680887531.

It is an arithmetic number, because the mean of its divisors is an integer number (6146723550100).

Almost surely, 2^{21513532425343} is an apocalyptic number.

21513532425343 is a deficient number, since it is larger than the sum of its proper divisors (3073361775057).

21513532425343 is an equidigital number, since it uses as much as digits as its factorization.

21513532425343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3073361775056.

The product of its digits is 1296000, while the sum is 43.

Adding to 21513532425343 its reverse (34352423531512), we get a palindrome (55865955956855).

The spelling of 21513532425343 in words is "twenty-one trillion, five hundred thirteen billion, five hundred thirty-two million, four hundred twenty-five thousand, three hundred forty-three".