20331030121 has 2 divisors, whose sum is σ = 20331030122. Its totient is φ = 20331030120.

The previous prime is 20331030107. The next prime is 20331030191. The reversal of 20331030121 is 12103013302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19954670121 + 376360000 = 141261^2 + 19400^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331030121 - 2³³ = 11741095529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20331030095 and 20331030104.

It is not a weakly prime, because it can be changed into another prime (20331030101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165515060 + 10165515061.

It is an arithmetic number, because the mean of its divisors is an integer number (10165515061).

Almost surely, 2^20331030121 is an apocalyptic number.

It is an amenable number.

20331030121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331030121 is an equidigital number, since it uses as much as digits as its factorization.

20331030121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20331030121 its reverse (12103013302), we get a palindrome (32434043423).

The spelling of 20331030121 in words is "twenty billion, three hundred thirty-one million, thirty thousand, one hundred twenty-one".