12122021200021 has 2 divisors, whose sum is σ = 12122021200022. Its totient is φ = 12122021200020.

The previous prime is 12122021200001. The next prime is 12122021200039. The reversal of 12122021200021 is 12000212022121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10023112764900 + 2098908435121 = 3165930^2 + 1448761^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122021200021 - 2⁵ = 12122021199989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12122021199968 and 12122021200004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122021200001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061010600010 + 6061010600011.

It is an arithmetic number, because the mean of its divisors is an integer number (6061010600011).

Almost surely, 2^{12122021200021} is an apocalyptic number.

It is an amenable number.

12122021200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122021200021 is an equidigital number, since it uses as much as digits as its factorization.

12122021200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12122021200021 its reverse (12000212022121), we get a palindrome (24122233222142).

The spelling of 12122021200021 in words is "twelve trillion, one hundred twenty-two billion, twenty-one million, two hundred thousand, twenty-one".