21543124353 has 64 divisors (see below), whose sum is σ = 32349715200. Its totient is φ = 12688220160.

The previous prime is 21543124327. The next prime is 21543124417. The reversal of 21543124353 is 35342134512.

It is not a de Polignac number, because 21543124353 - 2⁵ = 21543124321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21543124453) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8028150 + ... + 8030832.

It is an arithmetic number, because the mean of its divisors is an integer number (505464300).

Almost surely, 2^21543124353 is an apocalyptic number.

It is an amenable number.

21543124353 is a deficient number, since it is larger than the sum of its proper divisors (10806590847).

21543124353 is a wasteful number, since it uses less digits than its factorization.

21543124353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882.

The product of its digits is 43200, while the sum is 33.

Adding to 21543124353 its reverse (35342134512), we get a palindrome (56885258865).

The spelling of 21543124353 in words is "twenty-one billion, five hundred forty-three million, one hundred twenty-four thousand, three hundred fifty-three".