21333433313 has 2 divisors, whose sum is σ = 21333433314. Its totient is φ = 21333433312.

The previous prime is 21333433307. The next prime is 21333433321. The reversal of 21333433313 is 31333433312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14001278929 + 7332154384 = 118327^2 + 85628^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333433313 - 2¹⁶ = 21333367777 is a prime.

It is not a weakly prime, because it can be changed into another prime (21333433343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666716656 + 10666716657.

It is an arithmetic number, because the mean of its divisors is an integer number (10666716657).

Almost surely, 2^21333433313 is an apocalyptic number.

It is an amenable number.

21333433313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333433313 is an equidigital number, since it uses as much as digits as its factorization.

21333433313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 29.

Adding to 21333433313 its reverse (31333433312), we get a palindrome (52666866625).

Subtracting 21333433313 from its reverse (31333433312), we obtain a palindrome (9999999999).

The spelling of 21333433313 in words is "twenty-one billion, three hundred thirty-three million, four hundred thirty-three thousand, three hundred thirteen".