216336625006421 has 2 divisors, whose sum is σ = 216336625006422. Its totient is φ = 216336625006420.

The previous prime is 216336625006393. The next prime is 216336625006441. The reversal of 216336625006421 is 124600526633612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190170443452900 + 26166181553521 = 13790230^2 + 5115289^2 .

It is a cyclic number.

It is not a de Polignac number, because 216336625006421 - 2⁶ = 216336625006357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216336625006441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108168312503210 + 108168312503211.

It is an arithmetic number, because the mean of its divisors is an integer number (108168312503211).

Almost surely, 2^{216336625006421} is an apocalyptic number.

It is an amenable number.

216336625006421 is a deficient number, since it is larger than the sum of its proper divisors (1).

216336625006421 is an equidigital number, since it uses as much as digits as its factorization.

216336625006421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 216336625006421 in words is "two hundred sixteen trillion, three hundred thirty-six billion, six hundred twenty-five million, six thousand, four hundred twenty-one".