21333130121 has 2 divisors, whose sum is σ = 21333130122. Its totient is φ = 21333130120.

The previous prime is 21333130087. The next prime is 21333130139. The reversal of 21333130121 is 12103133312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10956855625 + 10376274496 = 104675^2 + 101864^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333130121 - 2³⁰ = 20259388297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21333130093 and 21333130102.

It is not a weakly prime, because it can be changed into another prime (21333130421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666565060 + 10666565061.

It is an arithmetic number, because the mean of its divisors is an integer number (10666565061).

Almost surely, 2^21333130121 is an apocalyptic number.

It is an amenable number.

21333130121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333130121 is an equidigital number, since it uses as much as digits as its factorization.

21333130121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21333130121 its reverse (12103133312), we get a palindrome (33436263433).

The spelling of 21333130121 in words is "twenty-one billion, three hundred thirty-three million, one hundred thirty thousand, one hundred twenty-one".