11939393921 has 32 divisors (see below), whose sum is σ = 14872128768. Its totient is φ = 9332870400.

The previous prime is 11939393911. The next prime is 11939393929. The reversal of 11939393921 is 12939393911.

It is not a de Polignac number, because 11939393921 - 2³⁰ = 10865652097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11939393921.

It is not an unprimeable number, because it can be changed into a prime (11939393929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5394011 + ... + 5396223.

It is an arithmetic number, because the mean of its divisors is an integer number (464754024).

Almost surely, 2^11939393921 is an apocalyptic number.

It is an amenable number.

11939393921 is a deficient number, since it is larger than the sum of its proper divisors (2932734847).

11939393921 is a wasteful number, since it uses less digits than its factorization.

11939393921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921.

The product of its digits is 354294, while the sum is 50.

The spelling of 11939393921 in words is "eleven billion, nine hundred thirty-nine million, three hundred ninety-three thousand, nine hundred twenty-one".