12111121005 has 8 divisors (see below), whose sum is σ = 19377793632. Its totient is φ = 6459264528.

The previous prime is 12111120953. The next prime is 12111121007. The reversal of 12111121005 is 50012111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12111121005 - 2¹⁶ = 12111055469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 807408067 = 12111121005 / (1 + 2 + 1 + 1 + 1 + 1 + 2 + 1 + 0 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111121007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403704019 + ... + 403704048.

It is an arithmetic number, because the mean of its divisors is an integer number (2422224204).

Almost surely, 2^12111121005 is an apocalyptic number.

12111121005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12111121005 is a deficient number, since it is larger than the sum of its proper divisors (7266672627).

12111121005 is an equidigital number, since it uses as much as digits as its factorization.

12111121005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807408075.

The product of its (nonzero) digits is 20, while the sum is 15.

Adding to 12111121005 its reverse (50012111121), we get a palindrome (62123232126).

The spelling of 12111121005 in words is "twelve billion, one hundred eleven million, one hundred twenty-one thousand, five".