199522121 has 2 divisors, whose sum is σ = 199522122. Its totient is φ = 199522120.

The previous prime is 199522109. The next prime is 199522139. The reversal of 199522121 is 121225991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104264521 + 95257600 = 10211^2 + 9760^2 .

It is an emirp because it is prime and its reverse (121225991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199522121 - 2¹⁴ = 199505737 is a prime.

It is a Chen prime.

It is equal to p_11053958 and since 199522121 and 11053958 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (199525121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99761060 + 99761061.

It is an arithmetic number, because the mean of its divisors is an integer number (99761061).

Almost surely, 2^199522121 is an apocalyptic number.

It is an amenable number.

199522121 is a deficient number, since it is larger than the sum of its proper divisors (1).

199522121 is an equidigital number, since it uses as much as digits as its factorization.

199522121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 32.

The square root of 199522121 is about 14125.2299450310. The cubic root of 199522121 is about 584.3374006178.

The spelling of 199522121 in words is "one hundred ninety-nine million, five hundred twenty-two thousand, one hundred twenty-one".