21533454223543 has 4 divisors (see below), whose sum is σ = 21543861888360. Its totient is φ = 21523046558728.

The previous prime is 21533454223537. The next prime is 21533454223549. The reversal of 21533454223543 is 34532245433512.

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

It is an interprime number because it is at equal distance from previous prime (21533454223537) and next prime (21533454223549).

It is a cyclic number.

It is not a de Polignac number, because 21533454223543 - 2¹⁷ = 21533454092471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21533454223493 and 21533454223502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533454223549) 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, 5203829305 + ... + 5203833442.

It is an arithmetic number, because the mean of its divisors is an integer number (5385965472090).

Almost surely, 2^{21533454223543} is an apocalyptic number.

21533454223543 is a deficient number, since it is larger than the sum of its proper divisors (10407664817).

21533454223543 is a wasteful number, since it uses less digits than its factorization.

21533454223543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407664816.

The product of its digits is 5184000, while the sum is 46.

The spelling of 21533454223543 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred fifty-four million, two hundred twenty-three thousand, five hundred forty-three".