21543030434354 has 48 divisors (see below), whose sum is σ = 39488829333120. Its totient is φ = 8727342886080.

The previous prime is 21543030434339. The next prime is 21543030434417. The reversal of 21543030434354 is 45343403034512.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99793082 + ... + 100008725.

It is an arithmetic number, because the mean of its divisors is an integer number (822683944440).

Almost surely, 2^{21543030434354} is an apocalyptic number.

21543030434354 is a deficient number, since it is larger than the sum of its proper divisors (17945798898766).

21543030434354 is a wasteful number, since it uses less digits than its factorization.

21543030434354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199801875 (or 199801862 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 41.

Adding to 21543030434354 its reverse (45343403034512), we get a palindrome (66886433468866).

The spelling of 21543030434354 in words is "twenty-one trillion, five hundred forty-three billion, thirty million, four hundred thirty-four thousand, three hundred fifty-four".