20320033021 has 2 divisors, whose sum is σ = 20320033022. Its totient is φ = 20320033020.

The previous prime is 20320032959. The next prime is 20320033039. The reversal of 20320033021 is 12033002302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19751210521 + 568822500 = 140539^2 + 23850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320033021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20320032986 and 20320033004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320033061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160016510 + 10160016511.

It is an arithmetic number, because the mean of its divisors is an integer number (10160016511).

Almost surely, 2^20320033021 is an apocalyptic number.

It is an amenable number.

20320033021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320033021 is an equidigital number, since it uses as much as digits as its factorization.

20320033021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 20320033021 its reverse (12033002302), we get a palindrome (32353035323).

The spelling of 20320033021 in words is "twenty billion, three hundred twenty million, thirty-three thousand, twenty-one".