21313232033 has 2 divisors, whose sum is σ = 21313232034. Its totient is φ = 21313232032.

The previous prime is 21313232023. The next prime is 21313232071. The reversal of 21313232033 is 33023231312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18291751009 + 3021481024 = 135247^2 + 54968^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313232033 - 2⁸ = 21313231777 is a prime.

It is not a weakly prime, because it can be changed into another prime (21313232023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656616016 + 10656616017.

It is an arithmetic number, because the mean of its divisors is an integer number (10656616017).

Almost surely, 2^21313232033 is an apocalyptic number.

It is an amenable number.

21313232033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313232033 is an equidigital number, since it uses as much as digits as its factorization.

21313232033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21313232033 its reverse (33023231312), we get a palindrome (54336463345).

The spelling of 21313232033 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-two thousand, thirty-three".