20023300021 has 2 divisors, whose sum is σ = 20023300022. Its totient is φ = 20023300020.

The previous prime is 20023300007. The next prime is 20023300061. The reversal of 20023300021 is 12000332002.

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., 19952975025 + 70324996 = 141255^2 + 8386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023300021 - 2¹³ = 20023291829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20023299974 and 20023300010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20023300061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011650010 + 10011650011.

It is an arithmetic number, because the mean of its divisors is an integer number (10011650011).

Almost surely, 2^20023300021 is an apocalyptic number.

It is an amenable number.

20023300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023300021 is an equidigital number, since it uses as much as digits as its factorization.

20023300021 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 20023300021 its reverse (12000332002), we get a palindrome (32023632023).

The spelling of 20023300021 in words is "twenty billion, twenty-three million, three hundred thousand, twenty-one".