21132322543 has 2 divisors, whose sum is σ = 21132322544. Its totient is φ = 21132322542.

The previous prime is 21132322511. The next prime is 21132322577. The reversal of 21132322543 is 34522323112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21132322543 - 2⁵ = 21132322511 is a prime.

It is a super-2 number, since 2×21132322543² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132322943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566161271 + 10566161272.

It is an arithmetic number, because the mean of its divisors is an integer number (10566161272).

Almost surely, 2^21132322543 is an apocalyptic number.

21132322543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132322543 is an equidigital number, since it uses as much as digits as its factorization.

21132322543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 28.

Adding to 21132322543 its reverse (34522323112), we get a palindrome (55654645655).

The spelling of 21132322543 in words is "twenty-one billion, one hundred thirty-two million, three hundred twenty-two thousand, five hundred forty-three".