221491448 has 32 divisors (see below), whose sum is σ = 425390400. Its totient is φ = 108068352.

The previous prime is 221491441. The next prime is 221491451. The reversal of 221491448 is 844194122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221491441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171188 + ... + 172476.

It is an arithmetic number, because the mean of its divisors is an integer number (13293450).

Almost surely, 2^221491448 is an apocalyptic number.

It is an amenable number.

221491448 is a deficient number, since it is larger than the sum of its proper divisors (203898952).

221491448 is a wasteful number, since it uses less digits than its factorization.

221491448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1795 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 221491448 is about 14882.5887533050. The cubic root of 221491448 is about 605.0421827019.

The spelling of 221491448 in words is "two hundred twenty-one million, four hundred ninety-one thousand, four hundred forty-eight".