199164421 has 4 divisors (see below), whose sum is σ = 200927052. Its totient is φ = 197401792.

The previous prime is 199164397. The next prime is 199164437. The reversal of 199164421 is 124461991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124461991 = 3847 ⋅32353.

It can be written as a sum of positive squares in 2 ways, for example, as 2772225 + 196392196 = 1665^2 + 14014^2 .

It is a cyclic number.

It is not a de Polignac number, because 199164421 - 2⁵ = 199164389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199164461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881146 + ... + 881371.

It is an arithmetic number, because the mean of its divisors is an integer number (50231763).

Almost surely, 2^199164421 is an apocalyptic number.

It is an amenable number.

199164421 is a deficient number, since it is larger than the sum of its proper divisors (1762631).

199164421 is a wasteful number, since it uses less digits than its factorization.

199164421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762630.

The product of its digits is 15552, while the sum is 37.

The square root of 199164421 is about 14112.5625242193. The cubic root of 199164421 is about 583.9879948821.

The spelling of 199164421 in words is "one hundred ninety-nine million, one hundred sixty-four thousand, four hundred twenty-one".