215021822369 has 2 divisors, whose sum is σ = 215021822370. Its totient is φ = 215021822368.

The previous prime is 215021822359. The next prime is 215021822417. The reversal of 215021822369 is 963228120512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203671690000 + 11350132369 = 451300^2 + 106537^2 .

It is a cyclic number.

It is not a de Polignac number, because 215021822369 - 2²⁴ = 215005045153 is a prime.

It is a super-2 number, since 2×215021822369² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (215021822359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107510911184 + 107510911185.

It is an arithmetic number, because the mean of its divisors is an integer number (107510911185).

Almost surely, 2^215021822369 is an apocalyptic number.

It is an amenable number.

215021822369 is a deficient number, since it is larger than the sum of its proper divisors (1).

215021822369 is an equidigital number, since it uses as much as digits as its factorization.

215021822369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 215021822369 in words is "two hundred fifteen billion, twenty-one million, eight hundred twenty-two thousand, three hundred sixty-nine".