21440331013 has 2 divisors, whose sum is σ = 21440331014. Its totient is φ = 21440331012.

The previous prime is 21440331001. The next prime is 21440331067. The reversal of 21440331013 is 31013304412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14771485444 + 6668845569 = 121538^2 + 81663^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440331013 - 2⁹ = 21440330501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440331083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720165506 + 10720165507.

It is an arithmetic number, because the mean of its divisors is an integer number (10720165507).

Almost surely, 2^21440331013 is an apocalyptic number.

It is an amenable number.

21440331013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440331013 is an equidigital number, since it uses as much as digits as its factorization.

21440331013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21440331013 its reverse (31013304412), we get a palindrome (52453635425).

The spelling of 21440331013 in words is "twenty-one billion, four hundred forty million, three hundred thirty-one thousand, thirteen".