12038911921 has 4 divisors (see below), whose sum is σ = 12130812144. Its totient is φ = 11947011700.

The previous prime is 12038911883. The next prime is 12038911939. The reversal of 12038911921 is 12911983021.

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 12038911921 - 2⁷ = 12038911793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12038911991) 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 3 ways as a sum of consecutive naturals, for example, 45949915 + ... + 45950176.

It is an arithmetic number, because the mean of its divisors is an integer number (3032703036).

Almost surely, 2^12038911921 is an apocalyptic number.

It is an amenable number.

12038911921 is a deficient number, since it is larger than the sum of its proper divisors (91900223).

12038911921 is an equidigital number, since it uses as much as digits as its factorization.

12038911921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91900222.

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 12038911921 in words is "twelve billion, thirty-eight million, nine hundred eleven thousand, nine hundred twenty-one".