421021323304121 has 2 divisors, whose sum is σ = 421021323304122. Its totient is φ = 421021323304120.

The previous prime is 421021323304097. The next prime is 421021323304199. The reversal of 421021323304121 is 121403323120124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239358369806521 + 181662953497600 = 15471211^2 + 13478240^2 .

It is a cyclic number.

It is not a de Polignac number, because 421021323304121 - 2²⁶ = 421021256195257 is a prime.

It is not a weakly prime, because it can be changed into another prime (421021323304721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210510661652060 + 210510661652061.

It is an arithmetic number, because the mean of its divisors is an integer number (210510661652061).

Almost surely, 2^{421021323304121} is an apocalyptic number.

It is an amenable number.

421021323304121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421021323304121 is an equidigital number, since it uses as much as digits as its factorization.

421021323304121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 421021323304121 its reverse (121403323120124), we get a palindrome (542424646424245).

The spelling of 421021323304121 in words is "four hundred twenty-one trillion, twenty-one billion, three hundred twenty-three million, three hundred four thousand, one hundred twenty-one".