21023045513543 has 2 divisors, whose sum is σ = 21023045513544. Its totient is φ = 21023045513542.

The previous prime is 21023045513537. The next prime is 21023045513567. The reversal of 21023045513543 is 34531554032012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023045513543 - 2¹⁰ = 21023045512519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023045513497 and 21023045513506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023045513573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511522756771 + 10511522756772.

It is an arithmetic number, because the mean of its divisors is an integer number (10511522756772).

Almost surely, 2^{21023045513543} is an apocalyptic number.

21023045513543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023045513543 is an equidigital number, since it uses as much as digits as its factorization.

21023045513543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 21023045513543 its reverse (34531554032012), we get a palindrome (55554599545555).

The spelling of 21023045513543 in words is "twenty-one trillion, twenty-three billion, forty-five million, five hundred thirteen thousand, five hundred forty-three".