199227821 has 8 divisors (see below), whose sum is σ = 216244224. Its totient is φ = 182453040.

The previous prime is 199227799. The next prime is 199227823. The reversal of 199227821 is 128722991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199227821 - 2¹⁴ = 199211437 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 (199227823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58685 + ... + 61986.

It is an arithmetic number, because the mean of its divisors is an integer number (27030528).

Almost surely, 2^199227821 is an apocalyptic number.

It is an amenable number.

199227821 is a deficient number, since it is larger than the sum of its proper divisors (17016403).

199227821 is a wasteful number, since it uses less digits than its factorization.

199227821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120811.

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

The square root of 199227821 is about 14114.8085711426. The cubic root of 199227821 is about 584.0499552641.

The spelling of 199227821 in words is "one hundred ninety-nine million, two hundred twenty-seven thousand, eight hundred twenty-one".