21020008033 has 2 divisors, whose sum is σ = 21020008034. Its totient is φ = 21020008032.

The previous prime is 21020008013. The next prime is 21020008069. The reversal of 21020008033 is 33080002012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13925652049 + 7094355984 = 118007^2 + 84228^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020008033 - 2⁹ = 21020007521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21020008033.

It is not a weakly prime, because it can be changed into another prime (21020008013) 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, 10510004016 + 10510004017.

It is an arithmetic number, because the mean of its divisors is an integer number (10510004017).

Almost surely, 2^21020008033 is an apocalyptic number.

It is an amenable number.

21020008033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020008033 is an equidigital number, since it uses as much as digits as its factorization.

21020008033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The spelling of 21020008033 in words is "twenty-one billion, twenty million, eight thousand, thirty-three".