199503939921 has 32 divisors (see below), whose sum is σ = 315430391808. Its totient is φ = 110567480640.

The previous prime is 199503939883. The next prime is 199503939931. The reversal of 199503939921 is 129939305991.

199503939921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199503939921 - 2⁹ = 199503939409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199503939931) 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 31 ways as a sum of consecutive naturals, for example, 2127201 + ... + 2219006.

It is an arithmetic number, because the mean of its divisors is an integer number (9857199744).

Almost surely, 2^199503939921 is an apocalyptic number.

199503939921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199503939921 is a deficient number, since it is larger than the sum of its proper divisors (115926451887).

199503939921 is a wasteful number, since it uses less digits than its factorization.

199503939921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346341.

The product of its (nonzero) digits is 5314410, while the sum is 60.

The spelling of 199503939921 in words is "one hundred ninety-nine billion, five hundred three million, nine hundred thirty-nine thousand, nine hundred twenty-one".