21244342313 has 2 divisors, whose sum is σ = 21244342314. Its totient is φ = 21244342312.

The previous prime is 21244342303. The next prime is 21244342351. The reversal of 21244342313 is 31324344212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20863780249 + 380562064 = 144443^2 + 19508^2 .

It is a cyclic number.

It is not a de Polignac number, because 21244342313 - 2¹⁰ = 21244341289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21244342303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622171156 + 10622171157.

It is an arithmetic number, because the mean of its divisors is an integer number (10622171157).

Almost surely, 2^21244342313 is an apocalyptic number.

It is an amenable number.

21244342313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21244342313 is an equidigital number, since it uses as much as digits as its factorization.

21244342313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 29.

Adding to 21244342313 its reverse (31324344212), we get a palindrome (52568686525).

The spelling of 21244342313 in words is "twenty-one billion, two hundred forty-four million, three hundred forty-two thousand, three hundred thirteen".