18028027121 has 8 divisors (see below), whose sum is σ = 19415846184. Its totient is φ = 16640357760.

The previous prime is 18028027097. The next prime is 18028027151. The reversal of 18028027121 is 12172082081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 882743521 + 17145283600 = 29711^2 + 130940^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18028027121 - 2²² = 18023832817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18028027151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418301 + ... + 459381.

It is an arithmetic number, because the mean of its divisors is an integer number (2426980773).

Almost surely, 2^18028027121 is an apocalyptic number.

It is an amenable number.

18028027121 is a deficient number, since it is larger than the sum of its proper divisors (1387819063).

18028027121 is a wasteful number, since it uses less digits than its factorization.

18028027121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74851.

The product of its (nonzero) digits is 3584, while the sum is 32.

The spelling of 18028027121 in words is "eighteen billion, twenty-eight million, twenty-seven thousand, one hundred twenty-one".