12121112005 has 8 divisors (see below), whose sum is σ = 14642955000. Its totient is φ = 9631809216.

The previous prime is 12121111927. The next prime is 12121112027. The reversal of 12121112005 is 50021112121.

It can be written as a sum of positive squares in 4 ways, for example, as 100620961 + 12020491044 = 10031^2 + 109638^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12121112005 - 2²⁷ = 11986894277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121112005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8134230 + ... + 8135719.

It is an arithmetic number, because the mean of its divisors is an integer number (1830369375).

Almost surely, 2^12121112005 is an apocalyptic number.

It is an amenable number.

12121112005 is a deficient number, since it is larger than the sum of its proper divisors (2521842995).

12121112005 is a wasteful number, since it uses less digits than its factorization.

12121112005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16270103.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 12121112005 its reverse (50021112121), we get a palindrome (62142224126).

The spelling of 12121112005 in words is "twelve billion, one hundred twenty-one million, one hundred twelve thousand, five".