21323043241 has 2 divisors, whose sum is σ = 21323043242. Its totient is φ = 21323043240.

The previous prime is 21323043239. The next prime is 21323043299. The reversal of 21323043241 is 14234032312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18987737616 + 2335305625 = 137796^2 + 48325^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323043241 - 2¹ = 21323043239 is a prime.

Together with 21323043239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21323043541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661521620 + 10661521621.

It is an arithmetic number, because the mean of its divisors is an integer number (10661521621).

Almost surely, 2^21323043241 is an apocalyptic number.

It is an amenable number.

21323043241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323043241 is an equidigital number, since it uses as much as digits as its factorization.

21323043241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21323043241 its reverse (14234032312), we get a palindrome (35557075553).

The spelling of 21323043241 in words is "twenty-one billion, three hundred twenty-three million, forty-three thousand, two hundred forty-one".