21131132333 has 2 divisors, whose sum is σ = 21131132334. Its totient is φ = 21131132332.

The previous prime is 21131132287. The next prime is 21131132371. The reversal of 21131132333 is 33323113112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20028759529 + 1102372804 = 141523^2 + 33202^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131132333 - 2¹² = 21131128237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21131132299 and 21131132308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131132233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565566166 + 10565566167.

It is an arithmetic number, because the mean of its divisors is an integer number (10565566167).

Almost surely, 2^21131132333 is an apocalyptic number.

It is an amenable number.

21131132333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131132333 is an equidigital number, since it uses as much as digits as its factorization.

21131132333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 23.

Adding to 21131132333 its reverse (33323113112), we get a palindrome (54454245445).

The spelling of 21131132333 in words is "twenty-one billion, one hundred thirty-one million, one hundred thirty-two thousand, three hundred thirty-three".