12039231921 has 64 divisors (see below), whose sum is σ = 17603308800. Its totient is φ = 7291109376.

The previous prime is 12039231917. The next prime is 12039231949. The reversal of 12039231921 is 12913293021.

It is not a de Polignac number, because 12039231921 - 2² = 12039231917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12039231121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44755375 + ... + 44755643.

It is an arithmetic number, because the mean of its divisors is an integer number (275051700).

Almost surely, 2^12039231921 is an apocalyptic number.

It is an amenable number.

12039231921 is a deficient number, since it is larger than the sum of its proper divisors (5564076879).

12039231921 is a wasteful number, since it uses less digits than its factorization.

12039231921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its (nonzero) digits is 5832, while the sum is 33.

The spelling of 12039231921 in words is "twelve billion, thirty-nine million, two hundred thirty-one thousand, nine hundred twenty-one".