199521033121 has 4 divisors (see below), whose sum is σ = 208195860672. Its totient is φ = 190846205572.

The previous prime is 199521033113. The next prime is 199521033157. The reversal of 199521033121 is 121330125991.

199521033121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121330125991 = 43 ⋅2821630837.

It is a cyclic number.

It is not a de Polignac number, because 199521033121 - 2³ = 199521033113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199521033421) 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 3 ways as a sum of consecutive naturals, for example, 4337413741 + ... + 4337413786.

It is an arithmetic number, because the mean of its divisors is an integer number (52048965168).

Almost surely, 2^199521033121 is an apocalyptic number.

It is an amenable number.

199521033121 is a deficient number, since it is larger than the sum of its proper divisors (8674827551).

199521033121 is an equidigital number, since it uses as much as digits as its factorization.

199521033121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8674827550.

The product of its (nonzero) digits is 14580, while the sum is 37.

The spelling of 199521033121 in words is "one hundred ninety-nine billion, five hundred twenty-one million, thirty-three thousand, one hundred twenty-one".