21324443611 has 2 divisors, whose sum is σ = 21324443612. Its totient is φ = 21324443610.

The previous prime is 21324443597. The next prime is 21324443633. The reversal of 21324443611 is 11634442312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21324443611 is a prime.

It is not a weakly prime, because it can be changed into another prime (21324443671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662221805 + 10662221806.

It is an arithmetic number, because the mean of its divisors is an integer number (10662221806).

Almost surely, 2^21324443611 is an apocalyptic number.

21324443611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324443611 is an equidigital number, since it uses as much as digits as its factorization.

21324443611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 31.

Adding to 21324443611 its reverse (11634442312), we get a palindrome (32958885923).

The spelling of 21324443611 in words is "twenty-one billion, three hundred twenty-four million, four hundred forty-three thousand, six hundred eleven".