221082418 has 8 divisors (see below), whose sum is σ = 331752348. Its totient is φ = 110498304.

The previous prime is 221082403. The next prime is 221082431. The reversal of 221082418 is 814280122.

It can be written as a sum of positive squares in 2 ways, for example, as 203718529 + 17363889 = 14273^2 + 4167^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14571 + ... + 25582.

Almost surely, 2^221082418 is an apocalyptic number.

221082418 is a deficient number, since it is larger than the sum of its proper divisors (110669930).

221082418 is a wasteful number, since it uses less digits than its factorization.

221082418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42908.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 221082418 is about 14868.8405062399. The cubic root of 221082418 is about 604.6695078137.

The spelling of 221082418 in words is "two hundred twenty-one million, eighty-two thousand, four hundred eighteen".