12122030331821 has 2 divisors, whose sum is σ = 12122030331822. Its totient is φ = 12122030331820.

The previous prime is 12122030331769. The next prime is 12122030331839. The reversal of 12122030331821 is 12813303022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8486472054025 + 3635558277796 = 2913155^2 + 1906714^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122030331821 - 2⁶ = 12122030331757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122030331881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061015165910 + 6061015165911.

It is an arithmetic number, because the mean of its divisors is an integer number (6061015165911).

Almost surely, 2^{12122030331821} is an apocalyptic number.

It is an amenable number.

12122030331821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122030331821 is an equidigital number, since it uses as much as digits as its factorization.

12122030331821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 12122030331821 its reverse (12813303022121), we get a palindrome (24935333353942).

The spelling of 12122030331821 in words is "twelve trillion, one hundred twenty-two billion, thirty million, three hundred thirty-one thousand, eight hundred twenty-one".