12171899027 has 4 divisors (see below), whose sum is σ = 12191755920. Its totient is φ = 12152042136.

The previous prime is 12171899021. The next prime is 12171899059. The reversal of 12171899027 is 72099817121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12171899027 - 2¹⁴ = 12171882643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171899021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9927527 + ... + 9928752.

It is an arithmetic number, because the mean of its divisors is an integer number (3047938980).

Almost surely, 2^12171899027 is an apocalyptic number.

12171899027 is a deficient number, since it is larger than the sum of its proper divisors (19856893).

12171899027 is an equidigital number, since it uses as much as digits as its factorization.

12171899027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19856892.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 12171899027 in words is "twelve billion, one hundred seventy-one million, eight hundred ninety-nine thousand, twenty-seven".