21543030434355 has 64 divisors (see below), whose sum is σ = 34981487324160. Its totient is φ = 11319918220800.

The previous prime is 21543030434339. The next prime is 21543030434417. The reversal of 21543030434355 is 55343403034512.

It is not a de Polignac number, because 21543030434355 - 2⁴ = 21543030434339 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 997859901 + ... + 997881489.

It is an arithmetic number, because the mean of its divisors is an integer number (546585739440).

Almost surely, 2^{21543030434355} is an apocalyptic number.

21543030434355 is a deficient number, since it is larger than the sum of its proper divisors (13438456889805).

21543030434355 is a wasteful number, since it uses less digits than its factorization.

21543030434355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24972.

The product of its (nonzero) digits is 1296000, while the sum is 42.

Adding to 21543030434355 its reverse (55343403034512), we get a palindrome (76886433468867).

The spelling of 21543030434355 in words is "twenty-one trillion, five hundred forty-three billion, thirty million, four hundred thirty-four thousand, three hundred fifty-five".