199211089321 has 2 divisors, whose sum is σ = 199211089322. Its totient is φ = 199211089320.

The previous prime is 199211089313. The next prime is 199211089339. The reversal of 199211089321 is 123980112991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198884781225 + 326308096 = 445965^2 + 18064^2 .

It is a cyclic number.

It is not a de Polignac number, because 199211089321 - 2³ = 199211089313 is a prime.

It is not a weakly prime, because it can be changed into another prime (199211089421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99605544660 + 99605544661.

It is an arithmetic number, because the mean of its divisors is an integer number (99605544661).

Almost surely, 2^199211089321 is an apocalyptic number.

It is an amenable number.

199211089321 is a deficient number, since it is larger than the sum of its proper divisors (1).

199211089321 is an equidigital number, since it uses as much as digits as its factorization.

199211089321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 46.

The spelling of 199211089321 in words is "one hundred ninety-nine billion, two hundred eleven million, eighty-nine thousand, three hundred twenty-one".