199428213 has 4 divisors (see below), whose sum is σ = 265904288. Its totient is φ = 132952140.

The previous prime is 199428179. The next prime is 199428221. The reversal of 199428213 is 312824991.

199428213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 312824991 = 3 ⋅104274997.

It is not a de Polignac number, because 199428213 - 2⁶ = 199428149 is a prime.

It is a super-2 number, since 2×199428213² = 79543224280746738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199428233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33238033 + ... + 33238038.

It is an arithmetic number, because the mean of its divisors is an integer number (66476072).

Almost surely, 2^199428213 is an apocalyptic number.

It is an amenable number.

199428213 is a deficient number, since it is larger than the sum of its proper divisors (66476075).

199428213 is an equidigital number, since it uses as much as digits as its factorization.

199428213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66476074.

The product of its digits is 31104, while the sum is 39.

The square root of 199428213 is about 14121.9054309254. The cubic root of 199428213 is about 584.2457105876.

The spelling of 199428213 in words is "one hundred ninety-nine million, four hundred twenty-eight thousand, two hundred thirteen".