221206958393 has 2 divisors, whose sum is σ = 221206958394. Its totient is φ = 221206958392.

The previous prime is 221206958387. The next prime is 221206958417. The reversal of 221206958393 is 393859602122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213728686864 + 7478271529 = 462308^2 + 86477^2 .

It is a cyclic number.

It is not a de Polignac number, because 221206958393 - 2⁴ = 221206958377 is a prime.

It is not a weakly prime, because it can be changed into another prime (221206958303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110603479196 + 110603479197.

It is an arithmetic number, because the mean of its divisors is an integer number (110603479197).

Almost surely, 2^221206958393 is an apocalyptic number.

It is an amenable number.

221206958393 is a deficient number, since it is larger than the sum of its proper divisors (1).

221206958393 is an equidigital number, since it uses as much as digits as its factorization.

221206958393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 221206958393 in words is "two hundred twenty-one billion, two hundred six million, nine hundred fifty-eight thousand, three hundred ninety-three".