21369008033 has 2 divisors, whose sum is σ = 21369008034. Its totient is φ = 21369008032.

The previous prime is 21369008029. The next prime is 21369008039. The reversal of 21369008033 is 33080096312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16778539024 + 4590469009 = 129532^2 + 67753^2 .

It is a cyclic number.

It is not a de Polignac number, because 21369008033 - 2² = 21369008029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21369007984 and 21369008002.

It is not a weakly prime, because it can be changed into another prime (21369008039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10684504016 + 10684504017.

It is an arithmetic number, because the mean of its divisors is an integer number (10684504017).

Almost surely, 2^21369008033 is an apocalyptic number.

It is an amenable number.

21369008033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21369008033 is an equidigital number, since it uses as much as digits as its factorization.

21369008033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 21369008033 in words is "twenty-one billion, three hundred sixty-nine million, eight thousand, thirty-three".