210330210421421 has 2 divisors, whose sum is σ = 210330210421422. Its totient is φ = 210330210421420.

The previous prime is 210330210421417. The next prime is 210330210421427. The reversal of 210330210421421 is 124124012033012.

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., 172873191015625 + 37457019405796 = 13148125^2 + 6120214^2 .

It is a cyclic number.

It is not a de Polignac number, because 210330210421421 - 2² = 210330210421417 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 (210330210421427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105165105210710 + 105165105210711.

It is an arithmetic number, because the mean of its divisors is an integer number (105165105210711).

Almost surely, 2^{210330210421421} is an apocalyptic number.

It is an amenable number.

210330210421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

210330210421421 is an equidigital number, since it uses as much as digits as its factorization.

210330210421421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 210330210421421 its reverse (124124012033012), we get a palindrome (334454222454433).

The spelling of 210330210421421 in words is "two hundred ten trillion, three hundred thirty billion, two hundred ten million, four hundred twenty-one thousand, four hundred twenty-one".