21321321032213 has 2 divisors, whose sum is σ = 21321321032214. Its totient is φ = 21321321032212.

The previous prime is 21321321032203. The next prime is 21321321032281. The reversal of 21321321032213 is 31223012312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17031609001969 + 4289712030244 = 4126937^2 + 2071162^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321321032213 - 2⁶ = 21321321032149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321321032203) 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, 10660660516106 + 10660660516107.

It is an arithmetic number, because the mean of its divisors is an integer number (10660660516107).

Almost surely, 2^{21321321032213} is an apocalyptic number.

It is an amenable number.

21321321032213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321321032213 is an equidigital number, since it uses as much as digits as its factorization.

21321321032213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21321321032213 its reverse (31223012312312), we get a palindrome (52544333344525).

The spelling of 21321321032213 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred twenty-one million, thirty-two thousand, two hundred thirteen".