21001330213 has 2 divisors, whose sum is σ = 21001330214. Its totient is φ = 21001330212.

The previous prime is 21001330187. The next prime is 21001330253. The reversal of 21001330213 is 31203310012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14449722849 + 6551607364 = 120207^2 + 80942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001330213 - 2²¹ = 20999233061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001330253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500665106 + 10500665107.

It is an arithmetic number, because the mean of its divisors is an integer number (10500665107).

Almost surely, 2^21001330213 is an apocalyptic number.

It is an amenable number.

21001330213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001330213 is an equidigital number, since it uses as much as digits as its factorization.

21001330213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21001330213 its reverse (31203310012), we get a palindrome (52204640225).

The spelling of 21001330213 in words is "twenty-one billion, one million, three hundred thirty thousand, two hundred thirteen".