21335333213 has 2 divisors, whose sum is σ = 21335333214. Its totient is φ = 21335333212.

The previous prime is 21335333179. The next prime is 21335333231. The reversal of 21335333213 is 31233353312.

Together with next prime (21335333231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12176460409 + 9158872804 = 110347^2 + 95702^2 .

It is a cyclic number.

It is not a de Polignac number, because 21335333213 - 2¹² = 21335329117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21335333813) 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, 10667666606 + 10667666607.

It is an arithmetic number, because the mean of its divisors is an integer number (10667666607).

Almost surely, 2^21335333213 is an apocalyptic number.

It is an amenable number.

21335333213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21335333213 is an equidigital number, since it uses as much as digits as its factorization.

21335333213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 29.

Adding to 21335333213 its reverse (31233353312), we get a palindrome (52568686525).

The spelling of 21335333213 in words is "twenty-one billion, three hundred thirty-five million, three hundred thirty-three thousand, two hundred thirteen".