199119921 has 64 divisors (see below), whose sum is σ = 362643456. Its totient is φ = 93830400.

The previous prime is 199119889. The next prime is 199119923. The reversal of 199119921 is 129911991.

199119921 = 1434² + 1435² + ... + 1524².

It is not a de Polignac number, because 199119921 - 2⁵ = 199119889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199119923) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 182640 + ... + 183726.

It is an arithmetic number, because the mean of its divisors is an integer number (5666304).

Almost surely, 2^199119921 is an apocalyptic number.

199119921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199119921 is a deficient number, since it is larger than the sum of its proper divisors (163523535).

199119921 is a wasteful number, since it uses less digits than its factorization.

199119921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182.

The product of its digits is 13122, while the sum is 42.

The square root of 199119921 is about 14110.9858266529. The cubic root of 199119921 is about 583.9444974853.

It can be divided in two parts, 1991 and 19921, that added together give a palindrome (21912).

The spelling of 199119921 in words is "one hundred ninety-nine million, one hundred nineteen thousand, nine hundred twenty-one".