199584421 has 2 divisors, whose sum is σ = 199584422. Its totient is φ = 199584420.

The previous prime is 199584389. The next prime is 199584431. The reversal of 199584421 is 124485991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178516321 + 21068100 = 13361^2 + 4590^2 .

It is a cyclic number.

It is not a de Polignac number, because 199584421 - 2⁵ = 199584389 is a prime.

It is a super-2 number, since 2×199584421² = 79667882211810482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199584431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99792210 + 99792211.

It is an arithmetic number, because the mean of its divisors is an integer number (99792211).

Almost surely, 2^199584421 is an apocalyptic number.

It is an amenable number.

199584421 is a deficient number, since it is larger than the sum of its proper divisors (1).

199584421 is an equidigital number, since it uses as much as digits as its factorization.

199584421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 199584421 is about 14127.4350467450. The cubic root of 199584421 is about 584.3982133095.

The spelling of 199584421 in words is "one hundred ninety-nine million, five hundred eighty-four thousand, four hundred twenty-one".