221257984 has 18 divisors (see below), whose sum is σ = 441652190. Its totient is φ = 110628864.

The previous prime is 221257979. The next prime is 221258117. The reversal of 221257984 is 489752122.

It can be written as a sum of positive squares in only one way, i.e., 207360000 + 13897984 = 14400^2 + 3728^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431889 + ... + 432400.

Almost surely, 2^221257984 is an apocalyptic number.

It is an amenable number.

221257984 is a deficient number, since it is larger than the sum of its proper divisors (220394206).

221257984 is an frugal number, since it uses more digits than its factorization.

221257984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864305 (or 864291 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 221257984 is about 14874.7431574465. The cubic root of 221257984 is about 604.8295255408.

The spelling of 221257984 in words is "two hundred twenty-one million, two hundred fifty-seven thousand, nine hundred eighty-four".