21020132017 has 2 divisors, whose sum is σ = 21020132018. Its totient is φ = 21020132016.

The previous prime is 21020131999. The next prime is 21020132057. The reversal of 21020132017 is 71023102012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15841746496 + 5178385521 = 125864^2 + 71961^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020132017 - 2¹¹ = 21020129969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020131985 and 21020132003.

It is not a weakly prime, because it can be changed into another prime (21020132057) 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, 10510066008 + 10510066009.

It is an arithmetic number, because the mean of its divisors is an integer number (10510066009).

Almost surely, 2^21020132017 is an apocalyptic number.

It is an amenable number.

21020132017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020132017 is an equidigital number, since it uses as much as digits as its factorization.

21020132017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

Adding to 21020132017 its reverse (71023102012), we get a palindrome (92043234029).

The spelling of 21020132017 in words is "twenty-one billion, twenty million, one hundred thirty-two thousand, seventeen".