21144340043 has 2 divisors, whose sum is σ = 21144340044. Its totient is φ = 21144340042.

The previous prime is 21144340031. The next prime is 21144340069. The reversal of 21144340043 is 34004344112.

It is an a-pointer prime, because the next prime (21144340069) can be obtained adding 21144340043 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21144340043 - 2³² = 16849372747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21144339994 and 21144340021.

It is not a weakly prime, because it can be changed into another prime (21144340003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572170021 + 10572170022.

It is an arithmetic number, because the mean of its divisors is an integer number (10572170022).

Almost surely, 2^21144340043 is an apocalyptic number.

21144340043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144340043 is an equidigital number, since it uses as much as digits as its factorization.

21144340043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21144340043 its reverse (34004344112), we get a palindrome (55148684155).

The spelling of 21144340043 in words is "twenty-one billion, one hundred forty-four million, three hundred forty thousand, forty-three".