21154304543 has 2 divisors, whose sum is σ = 21154304544. Its totient is φ = 21154304542.

The previous prime is 21154304471. The next prime is 21154304593. The reversal of 21154304543 is 34540345112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21154304543 - 2⁸ = 21154304287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21154304593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577152271 + 10577152272.

It is an arithmetic number, because the mean of its divisors is an integer number (10577152272).

Almost surely, 2^21154304543 is an apocalyptic number.

21154304543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154304543 is an equidigital number, since it uses as much as digits as its factorization.

21154304543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21154304543 its reverse (34540345112), we get a palindrome (55694649655).

The spelling of 21154304543 in words is "twenty-one billion, one hundred fifty-four million, three hundred four thousand, five hundred forty-three".