21333433361 has 2 divisors, whose sum is σ = 21333433362. Its totient is φ = 21333433360.

The previous prime is 21333433343. The next prime is 21333433379. The reversal of 21333433361 is 16333433312.

It is a balanced prime because it is at equal distance from previous prime (21333433343) and next prime (21333433379).

It can be written as a sum of positive squares in only one way, i.e., 16851934225 + 4481499136 = 129815^2 + 66944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21333433361 is a prime.

It is not a weakly prime, because it can be changed into another prime (21333433321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666716680 + 10666716681.

It is an arithmetic number, because the mean of its divisors is an integer number (10666716681).

Almost surely, 2^21333433361 is an apocalyptic number.

It is an amenable number.

21333433361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333433361 is an equidigital number, since it uses as much as digits as its factorization.

21333433361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 32.

Adding to 21333433361 its reverse (16333433312), we get a palindrome (37666866673).

The spelling of 21333433361 in words is "twenty-one billion, three hundred thirty-three million, four hundred thirty-three thousand, three hundred sixty-one".