21030221213 has 2 divisors, whose sum is σ = 21030221214. Its totient is φ = 21030221212.

The previous prime is 21030221203. The next prime is 21030221227. The reversal of 21030221213 is 31212203012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18938713924 + 2091507289 = 137618^2 + 45733^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030221213 - 2²⁸ = 20761785757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21030221191 and 21030221200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515110606 + 10515110607.

It is an arithmetic number, because the mean of its divisors is an integer number (10515110607).

Almost surely, 2^21030221213 is an apocalyptic number.

It is an amenable number.

21030221213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030221213 is an equidigital number, since it uses as much as digits as its factorization.

21030221213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21030221213 its reverse (31212203012), we get a palindrome (52242424225).

The spelling of 21030221213 in words is "twenty-one billion, thirty million, two hundred twenty-one thousand, two hundred thirteen".