12158021571 has 16 divisors (see below), whose sum is σ = 16338301344. Its totient is φ = 8041612544.

The previous prime is 12158021539. The next prime is 12158021609. The reversal of 12158021571 is 17512085121.

It is a cyclic number.

It is not a de Polignac number, because 12158021571 - 2⁵ = 12158021539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12158021501) 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 15 ways as a sum of consecutive naturals, for example, 813361 + ... + 828173.

It is an arithmetic number, because the mean of its divisors is an integer number (1021143834).

Almost surely, 2^12158021571 is an apocalyptic number.

12158021571 is a deficient number, since it is larger than the sum of its proper divisors (4180279773).

12158021571 is a wasteful number, since it uses less digits than its factorization.

12158021571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16950.

The product of its (nonzero) digits is 5600, while the sum is 33.

The spelling of 12158021571 in words is "twelve billion, one hundred fifty-eight million, twenty-one thousand, five hundred seventy-one".