199021209 has 8 divisors (see below), whose sum is σ = 273921792. Its totient is φ = 128400720.

The previous prime is 199021189. The next prime is 199021211. The reversal of 199021209 is 902120991.

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

It is not a de Polignac number, because 199021209 - 2¹⁵ = 198988441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199021209.

It is not an unprimeable number, because it can be changed into a prime (199021259) 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, 1069914 + ... + 1070099.

It is an arithmetic number, because the mean of its divisors is an integer number (34240224).

Almost surely, 2^199021209 is an apocalyptic number.

It is an amenable number.

199021209 is a deficient number, since it is larger than the sum of its proper divisors (74900583).

199021209 is a wasteful number, since it uses less digits than its factorization.

199021209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140047.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 199021209 is about 14107.4876927113. The cubic root of 199021209 is about 583.8479863698.

The spelling of 199021209 in words is "one hundred ninety-nine million, twenty-one thousand, two hundred nine".