199084721 has 4 divisors (see below), whose sum is σ = 217183344. Its totient is φ = 180986100.

The previous prime is 199084709. The next prime is 199084729. The reversal of 199084721 is 127480991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127480991 = 11 ⋅11589181.

It is a cyclic number.

It is not a de Polignac number, because 199084721 - 2¹⁰ = 199083697 is a prime.

It is a super-2 number, since 2×199084721² = 79269452271295682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199084729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9049295 + ... + 9049316.

It is an arithmetic number, because the mean of its divisors is an integer number (54295836).

Almost surely, 2^199084721 is an apocalyptic number.

199084721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199084721 is a deficient number, since it is larger than the sum of its proper divisors (18098623).

199084721 is a wasteful number, since it uses less digits than its factorization.

199084721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18098622.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 199084721 is about 14109.7385163581. The cubic root of 199084721 is about 583.9100859650.

The spelling of 199084721 in words is "one hundred ninety-nine million, eighty-four thousand, seven hundred twenty-one".