21648754543 has 16 divisors (see below), whose sum is σ = 23619879360. Its totient is φ = 19722756096.

The previous prime is 21648754541. The next prime is 21648754559. The reversal of 21648754543 is 34545784612.

It is a cyclic number.

It is not a de Polignac number, because 21648754543 - 2¹ = 21648754541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648754541) 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, 334446 + ... + 393892.

It is an arithmetic number, because the mean of its divisors is an integer number (1476242460).

Almost surely, 2^21648754543 is an apocalyptic number.

21648754543 is a deficient number, since it is larger than the sum of its proper divisors (1971124817).

21648754543 is a wasteful number, since it uses less digits than its factorization.

21648754543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59826.

The product of its digits is 3225600, while the sum is 49.

The spelling of 21648754543 in words is "twenty-one billion, six hundred forty-eight million, seven hundred fifty-four thousand, five hundred forty-three".