221918416 has 20 divisors (see below), whose sum is σ = 430202500. Its totient is φ = 110898432.

The previous prime is 221918413. The next prime is 221918449. The reversal of 221918416 is 614819122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 88284816 + 133633600 = 9396^2 + 11560^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221918413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46510 + ... + 51058.

It is an arithmetic number, because the mean of its divisors is an integer number (21510125).

Almost surely, 2^221918416 is an apocalyptic number.

It is an amenable number.

221918416 is a deficient number, since it is larger than the sum of its proper divisors (208284084).

221918416 is a wasteful number, since it uses less digits than its factorization.

221918416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7606 (or 7600 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 221918416 is about 14896.9263943942. The cubic root of 221918416 is about 605.4307121227.

The spelling of 221918416 in words is "two hundred twenty-one million, nine hundred eighteen thousand, four hundred sixteen".