221152018 has 8 divisors (see below), whose sum is σ = 331947648. Its totient is φ = 110502804.

The previous prime is 221152013. The next prime is 221152027. The reversal of 221152018 is 810251122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221152018.

It is not an unprimeable number, because it can be changed into a prime (221152013) 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, 32746 + ... + 38917.

It is an arithmetic number, because the mean of its divisors is an integer number (41493456).

Almost surely, 2^221152018 is an apocalyptic number.

221152018 is a deficient number, since it is larger than the sum of its proper divisors (110795630).

221152018 is a wasteful number, since it uses less digits than its factorization.

221152018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73208.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 221152018 is about 14871.1807870122. The cubic root of 221152018 is about 604.7329541106.

The spelling of 221152018 in words is "two hundred twenty-one million, one hundred fifty-two thousand, eighteen".