20330020021 has 2 divisors, whose sum is σ = 20330020022. Its totient is φ = 20330020020.

The previous prime is 20330020003. The next prime is 20330020031. The reversal of 20330020021 is 12002003302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20316226225 + 13793796 = 142535^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330020021 - 2¹⁵ = 20329987253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20330019983 and 20330020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20330020031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165010010 + 10165010011.

It is an arithmetic number, because the mean of its divisors is an integer number (10165010011).

Almost surely, 2^20330020021 is an apocalyptic number.

It is an amenable number.

20330020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330020021 is an equidigital number, since it uses as much as digits as its factorization.

20330020021 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 20330020021 its reverse (12002003302), we get a palindrome (32332023323).

The spelling of 20330020021 in words is "twenty billion, three hundred thirty million, twenty thousand, twenty-one".