20323033021 has 2 divisors, whose sum is σ = 20323033022. Its totient is φ = 20323033020.

The previous prime is 20323033019. The next prime is 20323033037. The reversal of 20323033021 is 12033032302.

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., 12817409796 + 7505623225 = 113214^2 + 86635^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323033021 - 2¹ = 20323033019 is a prime.

Together with 20323033019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20323033021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20323033051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161516510 + 10161516511.

It is an arithmetic number, because the mean of its divisors is an integer number (10161516511).

Almost surely, 2^20323033021 is an apocalyptic number.

It is an amenable number.

20323033021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323033021 is an equidigital number, since it uses as much as digits as its factorization.

20323033021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 20323033021 its reverse (12033032302), we get a palindrome (32356065323).

The spelling of 20323033021 in words is "twenty billion, three hundred twenty-three million, thirty-three thousand, twenty-one".