199441121138 has 12 divisors (see below), whose sum is σ = 348004405422. Its totient is φ = 85474766160.

The previous prime is 199441121137. The next prime is 199441121167. The reversal of 199441121138 is 831121144991.

199441121138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 102107728849 + 97333392289 = 319543^2 + 311983^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199441121137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1017556643 + ... + 1017556838.

Almost surely, 2^199441121138 is an apocalyptic number.

199441121138 is a deficient number, since it is larger than the sum of its proper divisors (148563284284).

199441121138 is a wasteful number, since it uses less digits than its factorization.

199441121138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035113497 (or 2035113490 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The spelling of 199441121138 in words is "one hundred ninety-nine billion, four hundred forty-one million, one hundred twenty-one thousand, one hundred thirty-eight".