12042121145 has 8 divisors (see below), whose sum is σ = 14547529800. Its totient is φ = 9569040640.

The previous prime is 12042121141. The next prime is 12042121171. The reversal of 12042121145 is 54112124021.

It can be written as a sum of positive squares in 4 ways, for example, as 62599744 + 11979521401 = 7912^2 + 109451^2 .

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

It is not a de Polignac number, because 12042121145 - 2² = 12042121141 is a prime.

It is a super-2 number, since 2×12042121145² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12042121145.

It is not an unprimeable number, because it can be changed into a prime (12042121141) 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 7 ways as a sum of consecutive naturals, for example, 8081216 + ... + 8082705.

It is an arithmetic number, because the mean of its divisors is an integer number (1818441225).

Almost surely, 2^12042121145 is an apocalyptic number.

It is an amenable number.

12042121145 is a deficient number, since it is larger than the sum of its proper divisors (2505408655).

12042121145 is a wasteful number, since it uses less digits than its factorization.

12042121145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16164075.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 12042121145 its reverse (54112124021), we get a palindrome (66154245166).

The spelling of 12042121145 in words is "twelve billion, forty-two million, one hundred twenty-one thousand, one hundred forty-five".