12121275506 has 16 divisors (see below), whose sum is σ = 18640684440. Its totient is φ = 5907957120.

The previous prime is 12121275503. The next prime is 12121275527. The reversal of 12121275506 is 60557212121.

It can be written as a sum of positive squares in 4 ways, for example, as 8453883025 + 3667392481 = 91945^2 + 60559^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12121275503) 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, 40640 + ... + 160916.

Almost surely, 2^12121275506 is an apocalyptic number.

12121275506 is a deficient number, since it is larger than the sum of its proper divisors (6519408934).

12121275506 is a wasteful number, since it uses less digits than its factorization.

12121275506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121549.

The product of its (nonzero) digits is 8400, while the sum is 32.

Adding to 12121275506 its reverse (60557212121), we get a palindrome (72678487627).

The spelling of 12121275506 in words is "twelve billion, one hundred twenty-one million, two hundred seventy-five thousand, five hundred six".