12171899028 has 24 divisors (see below), whose sum is σ = 29168696032. Its totient is φ = 3947642784.

The previous prime is 12171899021. The next prime is 12171899059. The reversal of 12171899028 is 82099817121.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13706650 + ... + 13707537.

Almost surely, 2^12171899028 is an apocalyptic number.

It is an amenable number.

12171899028 is an abundant number, since it is smaller than the sum of its proper divisors (16996797004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12171899028 is a wasteful number, since it uses less digits than its factorization.

12171899028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27414231 (or 27414229 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 48.

The spelling of 12171899028 in words is "twelve billion, one hundred seventy-one million, eight hundred ninety-nine thousand, twenty-eight".