199505146121 has 8 divisors (see below), whose sum is σ = 204501794304. Its totient is φ = 194539825440.

The previous prime is 199505146109. The next prime is 199505146189. The reversal of 199505146121 is 121641505991.

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

It is a cyclic number.

It is not a de Polignac number, because 199505146121 - 2¹⁰ = 199505145097 is a prime.

It is a super-2 number, since 2×199505146121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199505146021) 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, 7818980 + ... + 7844453.

It is an arithmetic number, because the mean of its divisors is an integer number (25562724288).

Almost surely, 2^199505146121 is an apocalyptic number.

It is an amenable number.

199505146121 is a deficient number, since it is larger than the sum of its proper divisors (4996648183).

199505146121 is a wasteful number, since it uses less digits than its factorization.

199505146121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15663751.

The product of its (nonzero) digits is 97200, while the sum is 44.

The spelling of 199505146121 in words is "one hundred ninety-nine billion, five hundred five million, one hundred forty-six thousand, one hundred twenty-one".