421094218 has 4 divisors (see below), whose sum is σ = 631641330. Its totient is φ = 210547108.

The previous prime is 421094203. The next prime is 421094221. The reversal of 421094218 is 812490124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 355435609 + 65658609 = 18853^2 + 8103^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 421094218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105273553 + ... + 105273556.

Almost surely, 2^421094218 is an apocalyptic number.

421094218 is a deficient number, since it is larger than the sum of its proper divisors (210547112).

421094218 is a wasteful number, since it uses less digits than its factorization.

421094218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210547111.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 421094218 is about 20520.5803524169. The cubic root of 421094218 is about 749.5370286392.

The spelling of 421094218 in words is "four hundred twenty-one million, ninety-four thousand, two hundred eighteen".