221009965904393 has 2 divisors, whose sum is σ = 221009965904394. Its totient is φ = 221009965904392.

The previous prime is 221009965904389. The next prime is 221009965904423. The reversal of 221009965904393 is 393409569900122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156926530729024 + 64083435175369 = 12527032^2 + 8005213^2 .

It is a cyclic number.

It is not a de Polignac number, because 221009965904393 - 2² = 221009965904389 is a prime.

It is not a weakly prime, because it can be changed into another prime (221009965903393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110504982952196 + 110504982952197.

It is an arithmetic number, because the mean of its divisors is an integer number (110504982952197).

Almost surely, 2^{221009965904393} is an apocalyptic number.

It is an amenable number.

221009965904393 is a deficient number, since it is larger than the sum of its proper divisors (1).

221009965904393 is an equidigital number, since it uses as much as digits as its factorization.

221009965904393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28343520, while the sum is 62.

The spelling of 221009965904393 in words is "two hundred twenty-one trillion, nine billion, nine hundred sixty-five million, nine hundred four thousand, three hundred ninety-three".