21312333303133 has 2 divisors, whose sum is σ = 21312333303134. Its totient is φ = 21312333303132.

The previous prime is 21312333303119. The next prime is 21312333303199. The reversal of 21312333303133 is 33130333321312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20153293734564 + 1159039568569 = 4489242^2 + 1076587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312333303133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21312333303095 and 21312333303104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312333300133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656166651566 + 10656166651567.

It is an arithmetic number, because the mean of its divisors is an integer number (10656166651567).

Almost surely, 2^{21312333303133} is an apocalyptic number.

It is an amenable number.

21312333303133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312333303133 is an equidigital number, since it uses as much as digits as its factorization.

21312333303133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 31.

Adding to 21312333303133 its reverse (33130333321312), we get a palindrome (54442666624445).

The spelling of 21312333303133 in words is "twenty-one trillion, three hundred twelve billion, three hundred thirty-three million, three hundred three thousand, one hundred thirty-three".