20320003021 has 2 divisors, whose sum is σ = 20320003022. Its totient is φ = 20320003020.

The previous prime is 20320003007. The next prime is 20320003043. The reversal of 20320003021 is 12030002302.

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., 13630562500 + 6689440521 = 116750^2 + 81789^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320003021 - 2¹¹ = 20320000973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20320002992 and 20320003010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320003421) 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, 10160001510 + 10160001511.

It is an arithmetic number, because the mean of its divisors is an integer number (10160001511).

Almost surely, 2^20320003021 is an apocalyptic number.

It is an amenable number.

20320003021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320003021 is an equidigital number, since it uses as much as digits as its factorization.

20320003021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 20320003021 its reverse (12030002302), we get a palindrome (32350005323).

The spelling of 20320003021 in words is "twenty billion, three hundred twenty million, three thousand, twenty-one".