199735421 has 2 divisors, whose sum is σ = 199735422. Its totient is φ = 199735420.

The previous prime is 199735379. The next prime is 199735447. The reversal of 199735421 is 124537991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118483225 + 81252196 = 10885^2 + 9014^2 .

It is a cyclic number.

It is not a de Polignac number, because 199735421 - 2⁶ = 199735357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199735321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99867710 + 99867711.

It is an arithmetic number, because the mean of its divisors is an integer number (99867711).

Almost surely, 2^199735421 is an apocalyptic number.

It is an amenable number.

199735421 is a deficient number, since it is larger than the sum of its proper divisors (1).

199735421 is an equidigital number, since it uses as much as digits as its factorization.

199735421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 199735421 is about 14132.7782477473. The cubic root of 199735421 is about 584.5455559474.

The spelling of 199735421 in words is "one hundred ninety-nine million, seven hundred thirty-five thousand, four hundred twenty-one".