21131342213 has 2 divisors, whose sum is σ = 21131342214. Its totient is φ = 21131342212.

The previous prime is 21131342201. The next prime is 21131342249. The reversal of 21131342213 is 31224313112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15401306404 + 5730035809 = 124102^2 + 75697^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131342213 - 2³² = 16836374917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131342273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565671106 + 10565671107.

It is an arithmetic number, because the mean of its divisors is an integer number (10565671107).

Almost surely, 2^21131342213 is an apocalyptic number.

It is an amenable number.

21131342213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131342213 is an equidigital number, since it uses as much as digits as its factorization.

21131342213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 21131342213 its reverse (31224313112), we get a palindrome (52355655325).

The spelling of 21131342213 in words is "twenty-one billion, one hundred thirty-one million, three hundred forty-two thousand, two hundred thirteen".