21552501323543 has 4 divisors (see below), whose sum is σ = 21553431978480. Its totient is φ = 21551570668608.

The previous prime is 21552501323443. The next prime is 21552501323671. The reversal of 21552501323543 is 34532310525512.

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 21552501323543 - 2¹⁰ = 21552501322519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21552501323543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552501323443) 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, 465292730 + ... + 465339047.

It is an arithmetic number, because the mean of its divisors is an integer number (5388357994620).

Almost surely, 2^{21552501323543} is an apocalyptic number.

21552501323543 is a deficient number, since it is larger than the sum of its proper divisors (930654937).

21552501323543 is an equidigital number, since it uses as much as digits as its factorization.

21552501323543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930654936.

The product of its (nonzero) digits is 540000, while the sum is 41.

The spelling of 21552501323543 in words is "twenty-one trillion, five hundred fifty-two billion, five hundred one million, three hundred twenty-three thousand, five hundred forty-three".