221454328 has 32 divisors (see below), whose sum is σ = 429528960. Its totient is φ = 106928640.

The previous prime is 221454307. The next prime is 221454397. The reversal of 221454328 is 823454122.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 221454328.

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, 231900 + ... + 232852.

It is an arithmetic number, because the mean of its divisors is an integer number (13422780).

Almost surely, 2^221454328 is an apocalyptic number.

It is an amenable number.

221454328 is a deficient number, since it is larger than the sum of its proper divisors (208074632).

221454328 is a wasteful number, since it uses less digits than its factorization.

221454328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1923 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

The square root of 221454328 is about 14881.3416061859. The cubic root of 221454328 is about 605.0083809143.

The spelling of 221454328 in words is "two hundred twenty-one million, four hundred fifty-four thousand, three hundred twenty-eight".