20101330021 has 2 divisors, whose sum is σ = 20101330022. Its totient is φ = 20101330020.

The previous prime is 20101330001. The next prime is 20101330057. The reversal of 20101330021 is 12003310102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20100150625 + 1179396 = 141775^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101330021 - 2¹¹ = 20101327973 is a prime.

It is a super-2 number, since 2×20101330021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20101329983 and 20101330010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101330001) 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, 10050665010 + 10050665011.

It is an arithmetic number, because the mean of its divisors is an integer number (10050665011).

Almost surely, 2^20101330021 is an apocalyptic number.

It is an amenable number.

20101330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101330021 is an equidigital number, since it uses as much as digits as its factorization.

20101330021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20101330021 its reverse (12003310102), we get a palindrome (32104640123).

The spelling of 20101330021 in words is "twenty billion, one hundred one million, three hundred thirty thousand, twenty-one".