1118328221 has 8 divisors (see below), whose sum is σ = 1190126520. Its totient is φ = 1047198208.

The previous prime is 1118328203. The next prime is 1118328223. The reversal of 1118328221 is 1228238111.

It can be written as a sum of positive squares in 4 ways, for example, as 326524900 + 791803321 = 18070^2 + 28139^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1118328221 - 2⁶ = 1118328157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118328223) 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, 163616 + ... + 170313.

It is an arithmetic number, because the mean of its divisors is an integer number (148765815).

Almost surely, 2^1118328221 is an apocalyptic number.

It is an amenable number.

1118328221 is a deficient number, since it is larger than the sum of its proper divisors (71798299).

1118328221 is a wasteful number, since it uses less digits than its factorization.

1118328221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334143.

The product of its digits is 1536, while the sum is 29.

The square root of 1118328221 is about 33441.4147577521. The cubic root of 1118328221 is about 1037.9818545789.

The spelling of 1118328221 in words is "one billion, one hundred eighteen million, three hundred twenty-eight thousand, two hundred twenty-one".