21320334241 has 2 divisors, whose sum is σ = 21320334242. Its totient is φ = 21320334240.

The previous prime is 21320334209. The next prime is 21320334281. The reversal of 21320334241 is 14243302312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20655725841 + 664608400 = 143721^2 + 25780^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320334241 - 2⁵ = 21320334209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320334281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660167120 + 10660167121.

It is an arithmetic number, because the mean of its divisors is an integer number (10660167121).

Almost surely, 2^21320334241 is an apocalyptic number.

It is an amenable number.

21320334241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320334241 is an equidigital number, since it uses as much as digits as its factorization.

21320334241 is an evil number, because the sum of its binary digits is even.

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

Adding to 21320334241 its reverse (14243302312), we get a palindrome (35563636553).

The spelling of 21320334241 in words is "twenty-one billion, three hundred twenty million, three hundred thirty-four thousand, two hundred forty-one".