21233030213 has 2 divisors, whose sum is σ = 21233030214. Its totient is φ = 21233030212.

The previous prime is 21233030191. The next prime is 21233030239. The reversal of 21233030213 is 31203033212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18111238084 + 3121792129 = 134578^2 + 55873^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233030213 - 2¹⁴ = 21233013829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233036213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616515106 + 10616515107.

It is an arithmetic number, because the mean of its divisors is an integer number (10616515107).

Almost surely, 2^21233030213 is an apocalyptic number.

It is an amenable number.

21233030213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233030213 is an equidigital number, since it uses as much as digits as its factorization.

21233030213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21233030213 its reverse (31203033212), we get a palindrome (52436063425).

The spelling of 21233030213 in words is "twenty-one billion, two hundred thirty-three million, thirty thousand, two hundred thirteen".