21033112213 has 2 divisors, whose sum is σ = 21033112214. Its totient is φ = 21033112212.

The previous prime is 21033112211. The next prime is 21033112229. The reversal of 21033112213 is 31221133012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12246299569 + 8786812644 = 110663^2 + 93738^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033112213 - 2¹ = 21033112211 is a prime.

Together with 21033112211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033112211) 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, 10516556106 + 10516556107.

It is an arithmetic number, because the mean of its divisors is an integer number (10516556107).

Almost surely, 2^21033112213 is an apocalyptic number.

It is an amenable number.

21033112213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033112213 is an equidigital number, since it uses as much as digits as its factorization.

21033112213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21033112213 its reverse (31221133012), we get a palindrome (52254245225).

The spelling of 21033112213 in words is "twenty-one billion, thirty-three million, one hundred twelve thousand, two hundred thirteen".