20023210021 has 16 divisors (see below), whose sum is σ = 21636408640. Its totient is φ = 18468777600.

The previous prime is 20023210013. The next prime is 20023210061. The reversal of 20023210021 is 12001232002.

It is a cyclic number.

It is not a de Polignac number, because 20023210021 - 2³ = 20023210013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20023209983 and 20023210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023210061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216571 + ... + 294871.

It is an arithmetic number, because the mean of its divisors is an integer number (1352275540).

Almost surely, 2^20023210021 is an apocalyptic number.

It is an amenable number.

20023210021 is a deficient number, since it is larger than the sum of its proper divisors (1613198619).

20023210021 is a wasteful number, since it uses less digits than its factorization.

20023210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78676.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20023210021 its reverse (12001232002), we get a palindrome (32024442023).

The spelling of 20023210021 in words is "twenty billion, twenty-three million, two hundred ten thousand, twenty-one".