421200818 has 4 divisors (see below), whose sum is σ = 631801230. Its totient is φ = 210600408.

The previous prime is 421200811. The next prime is 421200827. The reversal of 421200818 is 818002124.

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., 315666289 + 105534529 = 17767^2 + 10273^2 .

It is not an unprimeable number, because it can be changed into a prime (421200811) by changing a digit.

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, 105300203 + ... + 105300206.

Almost surely, 2^421200818 is an apocalyptic number.

421200818 is a deficient number, since it is larger than the sum of its proper divisors (210600412).

421200818 is a wasteful number, since it uses less digits than its factorization.

421200818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210600411.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 421200818 is about 20523.1775804820. The cubic root of 421200818 is about 749.6002717350.

The spelling of 421200818 in words is "four hundred twenty-one million, two hundred thousand, eight hundred eighteen".