221798450 has 12 divisors (see below), whose sum is σ = 412545210. Its totient is φ = 88719360.

The previous prime is 221798441. The next prime is 221798471. The reversal of 221798450 is 54897122.

It can be written as a sum of positive squares in 3 ways, for example, as 86843761 + 134954689 = 9319^2 + 11617^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2217935 + ... + 2218034.

Almost surely, 2^221798450 is an apocalyptic number.

221798450 is a deficient number, since it is larger than the sum of its proper divisors (190746760).

221798450 is a wasteful number, since it uses less digits than its factorization.

221798450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4435981 (or 4435976 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 221798450 is about 14892.8993147741. The cubic root of 221798450 is about 605.3215966591.

The spelling of 221798450 in words is "two hundred twenty-one million, seven hundred ninety-eight thousand, four hundred fifty".