21100004543 has 2 divisors, whose sum is σ = 21100004544. Its totient is φ = 21100004542.

The previous prime is 21100004483. The next prime is 21100004557. The reversal of 21100004543 is 34540000112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100004543 - 2²⁰ = 21098955967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100004743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550002271 + 10550002272.

It is an arithmetic number, because the mean of its divisors is an integer number (10550002272).

Almost surely, 2^21100004543 is an apocalyptic number.

21100004543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100004543 is an equidigital number, since it uses as much as digits as its factorization.

21100004543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21100004543 its reverse (34540000112), we get a palindrome (55640004655).

The spelling of 21100004543 in words is "twenty-one billion, one hundred million, four thousand, five hundred forty-three".