21310321133 has 2 divisors, whose sum is σ = 21310321134. Its totient is φ = 21310321132.

The previous prime is 21310321027. The next prime is 21310321141. The reversal of 21310321133 is 33112301312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20479613449 + 830707684 = 143107^2 + 28822^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310321133 - 2¹⁴ = 21310304749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310321733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655160566 + 10655160567.

It is an arithmetic number, because the mean of its divisors is an integer number (10655160567).

Almost surely, 2^21310321133 is an apocalyptic number.

It is an amenable number.

21310321133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310321133 is an equidigital number, since it uses as much as digits as its factorization.

21310321133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21310321133 its reverse (33112301312), we get a palindrome (54422622445).

The spelling of 21310321133 in words is "twenty-one billion, three hundred ten million, three hundred twenty-one thousand, one hundred thirty-three".