20330221021 has 16 divisors (see below), whose sum is σ = 22859028288. Its totient is φ = 17918409600.

The previous prime is 20330221013. The next prime is 20330221039. The reversal of 20330221021 is 12012203302.

It is a cyclic number.

It is not a de Polignac number, because 20330221021 - 2³ = 20330221013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20330220986 and 20330221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20330221621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25486 + ... + 203248.

It is an arithmetic number, because the mean of its divisors is an integer number (1428689268).

Almost surely, 2^20330221021 is an apocalyptic number.

It is an amenable number.

20330221021 is a deficient number, since it is larger than the sum of its proper divisors (2528807267).

20330221021 is a wasteful number, since it uses less digits than its factorization.

20330221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178092.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20330221021 its reverse (12012203302), we get a palindrome (32342424323).

The spelling of 20330221021 in words is "twenty billion, three hundred thirty million, two hundred twenty-one thousand, twenty-one".