21443534143 has 2 divisors, whose sum is σ = 21443534144. Its totient is φ = 21443534142.

The previous prime is 21443534141. The next prime is 21443534153. The reversal of 21443534143 is 34143534412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21443534143 - 2¹ = 21443534141 is a prime.

Together with 21443534141, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21443534099 and 21443534108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21443534141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721767071 + 10721767072.

It is an arithmetic number, because the mean of its divisors is an integer number (10721767072).

Almost surely, 2^21443534143 is an apocalyptic number.

21443534143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443534143 is an equidigital number, since it uses as much as digits as its factorization.

21443534143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 34.

The spelling of 21443534143 in words is "twenty-one billion, four hundred forty-three million, five hundred thirty-four thousand, one hundred forty-three".