21543204326 has 16 divisors (see below), whose sum is σ = 36934682400. Its totient is φ = 9231933120.

The previous prime is 21543204317. The next prime is 21543204329. The reversal of 21543204326 is 62340234512.

It is a super-2 number, since 2×21543204326² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21543204292 and 21543204301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21543204329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95066 + ... + 228306.

It is an arithmetic number, because the mean of its divisors is an integer number (2308417650).

Almost surely, 2^21543204326 is an apocalyptic number.

21543204326 is a deficient number, since it is larger than the sum of its proper divisors (15391478074).

21543204326 is a wasteful number, since it uses less digits than its factorization.

21543204326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144799.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 21543204326 its reverse (62340234512), we get a palindrome (83883438838).

The spelling of 21543204326 in words is "twenty-one billion, five hundred forty-three million, two hundred four thousand, three hundred twenty-six".