17988934121 has 4 divisors (see below), whose sum is σ = 17999232912. Its totient is φ = 17978635332.

The previous prime is 17988934097. The next prime is 17988934147. The reversal of 17988934121 is 12143988971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17988934121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17988934921) 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, 5146775 + ... + 5150268.

It is an arithmetic number, because the mean of its divisors is an integer number (4499808228).

Almost surely, 2^17988934121 is an apocalyptic number.

It is an amenable number.

17988934121 is a deficient number, since it is larger than the sum of its proper divisors (10298791).

17988934121 is a wasteful number, since it uses less digits than its factorization.

17988934121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10298790.

The product of its digits is 870912, while the sum is 53.

The spelling of 17988934121 in words is "seventeen billion, nine hundred eighty-eight million, nine hundred thirty-four thousand, one hundred twenty-one".