21321001033 has 2 divisors, whose sum is σ = 21321001034. Its totient is φ = 21321001032.

The previous prime is 21321001021. The next prime is 21321001109. The reversal of 21321001033 is 33010012312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13892629689 + 7428371344 = 117867^2 + 86188^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321001033 - 2²⁹ = 20784130121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21321000998 and 21321001016.

It is not a weakly prime, because it can be changed into another prime (21321001003) 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, 10660500516 + 10660500517.

It is an arithmetic number, because the mean of its divisors is an integer number (10660500517).

Almost surely, 2^21321001033 is an apocalyptic number.

It is an amenable number.

21321001033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321001033 is an equidigital number, since it uses as much as digits as its factorization.

21321001033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21321001033 its reverse (33010012312), we get a palindrome (54331013345).

The spelling of 21321001033 in words is "twenty-one billion, three hundred twenty-one million, one thousand, thirty-three".