21444432143 has 2 divisors, whose sum is σ = 21444432144. Its totient is φ = 21444432142.

The previous prime is 21444432127. The next prime is 21444432161. The reversal of 21444432143 is 34123444412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444432143 - 2⁴ = 21444432127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444432193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722216071 + 10722216072.

It is an arithmetic number, because the mean of its divisors is an integer number (10722216072).

Almost surely, 2^21444432143 is an apocalyptic number.

21444432143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444432143 is an equidigital number, since it uses as much as digits as its factorization.

21444432143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 32.

Adding to 21444432143 its reverse (34123444412), we get a palindrome (55567876555).

The spelling of 21444432143 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty-two thousand, one hundred forty-three".