12171212552 has 8 divisors (see below), whose sum is σ = 22821023550. Its totient is φ = 6085606272.

The previous prime is 12171212539. The next prime is 12171212561. The reversal of 12171212552 is 25521217121.

It can be written as a sum of positive squares in only one way, i.e., 11091038596 + 1080173956 = 105314^2 + 32866^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 760700777 + ... + 760700792.

Almost surely, 2^12171212552 is an apocalyptic number.

It is an amenable number.

12171212552 is a deficient number, since it is larger than the sum of its proper divisors (10649810998).

12171212552 is a wasteful number, since it uses less digits than its factorization.

12171212552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521401575 (or 1521401571 counting only the distinct ones).

The product of its digits is 2800, while the sum is 29.

Adding to 12171212552 its reverse (25521217121), we get a palindrome (37692429673).

The spelling of 12171212552 in words is "twelve billion, one hundred seventy-one million, two hundred twelve thousand, five hundred fifty-two".