11938583921 has 4 divisors (see below), whose sum is σ = 13023909744. Its totient is φ = 10853258100.

The previous prime is 11938583857. The next prime is 11938583929. The reversal of 11938583921 is 12938583911.

11938583921 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.

It is a cyclic number.

It is not a de Polignac number, because 11938583921 - 2⁶ = 11938583857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11938583921.

It is not an unprimeable number, because it can be changed into a prime (11938583929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542662895 + ... + 542662916.

It is an arithmetic number, because the mean of its divisors is an integer number (3255977436).

Almost surely, 2^11938583921 is an apocalyptic number.

11938583921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11938583921 is a deficient number, since it is larger than the sum of its proper divisors (1085325823).

11938583921 is a wasteful number, since it uses less digits than its factorization.

11938583921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085325822.

The product of its digits is 466560, while the sum is 50.

The spelling of 11938583921 in words is "eleven billion, nine hundred thirty-eight million, five hundred eighty-three thousand, nine hundred twenty-one".