21335424420543 has 16 divisors (see below), whose sum is σ = 28458383508576. Its totient is φ = 14218041277440.

The previous prime is 21335424420509. The next prime is 21335424420581. The reversal of 21335424420543 is 34502442453312.

It is not a de Polignac number, because 21335424420543 - 2³³ = 21326834485951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21335424420495 and 21335424420504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335424420743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246720333 + ... + 246806793.

It is an arithmetic number, because the mean of its divisors is an integer number (1778648969286).

Almost surely, 2^{21335424420543} is an apocalyptic number.

21335424420543 is a deficient number, since it is larger than the sum of its proper divisors (7122959088033).

21335424420543 is a wasteful number, since it uses less digits than its factorization.

21335424420543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117754.

The product of its (nonzero) digits is 1382400, while the sum is 42.

Adding to 21335424420543 its reverse (34502442453312), we get a palindrome (55837866873855).

The spelling of 21335424420543 in words is "twenty-one trillion, three hundred thirty-five billion, four hundred twenty-four million, four hundred twenty thousand, five hundred forty-three".