199121850 has 72 divisors (see below), whose sum is σ = 566464860. Its totient is φ = 49973760.

The previous prime is 199121821. The next prime is 199121851. The reversal of 199121850 is 58121991.

It can be written as a sum of positive squares in 6 ways, for example, as 45684081 + 153437769 = 6759^2 + 12387^2 .

It is a super-2 number, since 2×199121850² = 79299022294845000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199121851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5365 + ... + 20664.

Almost surely, 2^199121850 is an apocalyptic number.

199121850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199121850 is an abundant number, since it is smaller than the sum of its proper divisors (367343010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199121850 is a wasteful number, since it uses less digits than its factorization.

199121850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26064 (or 26056 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 199121850 is about 14111.0541774879. The cubic root of 199121850 is about 583.9463831585.

The spelling of 199121850 in words is "one hundred ninety-nine million, one hundred twenty-one thousand, eight hundred fifty".