221804412 has 24 divisors (see below), whose sum is σ = 535390800. Its totient is φ = 71385216.

The previous prime is 221804399. The next prime is 221804431. The reversal of 221804412 is 214408122.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 318337 + ... + 319032.

It is an arithmetic number, because the mean of its divisors is an integer number (22307950).

Almost surely, 2^221804412 is an apocalyptic number.

It is an amenable number.

221804412 is an abundant number, since it is smaller than the sum of its proper divisors (313586388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221804412 is a wasteful number, since it uses less digits than its factorization.

221804412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637405 (or 637403 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 221804412 is about 14893.0994759318. The cubic root of 221804412 is about 605.3270203445.

The spelling of 221804412 in words is "two hundred twenty-one million, eight hundred four thousand, four hundred twelve".