20330220121 has 2 divisors, whose sum is σ = 20330220122. Its totient is φ = 20330220120.

The previous prime is 20330220109. The next prime is 20330220137. The reversal of 20330220121 is 12102203302.

It is an a-pointer prime, because the next prime (20330220137) can be obtained adding 20330220121 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19549632400 + 780587721 = 139820^2 + 27939^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330220121 - 2⁷ = 20330219993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20330220095 and 20330220104.

It is not a weakly prime, because it can be changed into another prime (20330220721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165110060 + 10165110061.

It is an arithmetic number, because the mean of its divisors is an integer number (10165110061).

Almost surely, 2^20330220121 is an apocalyptic number.

It is an amenable number.

20330220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330220121 is an equidigital number, since it uses as much as digits as its factorization.

20330220121 is an evil number, because the sum of its binary digits is even.

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

Adding to 20330220121 its reverse (12102203302), we get a palindrome (32432423423).

The spelling of 20330220121 in words is "twenty billion, three hundred thirty million, two hundred twenty thousand, one hundred twenty-one".