221081318 has 8 divisors (see below), whose sum is σ = 339334248. Its totient is φ = 107969904.

The previous prime is 221081317. The next prime is 221081323. The reversal of 221081318 is 813180122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221081317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285271 + ... + 1285442.

It is an arithmetic number, because the mean of its divisors is an integer number (42416781).

Almost surely, 2^221081318 is an apocalyptic number.

221081318 is a deficient number, since it is larger than the sum of its proper divisors (118252930).

221081318 is a wasteful number, since it uses less digits than its factorization.

221081318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570758.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 221081318 is about 14868.8035160870. The cubic root of 221081318 is about 604.6685049637.

The spelling of 221081318 in words is "two hundred twenty-one million, eighty-one thousand, three hundred eighteen".