221650320 has 40 divisors (see below), whose sum is σ = 687116736. Its totient is φ = 59106688.

The previous prime is 221650309. The next prime is 221650339. The reversal of 221650320 is 23056122.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×221650320² = 98257728712204800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 461532 + ... + 462011.

Almost surely, 2^221650320 is an apocalyptic number.

221650320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221650320 is an abundant number, since it is smaller than the sum of its proper divisors (465466416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221650320 is a wasteful number, since it uses less digits than its factorization.

221650320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923559 (or 923553 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221650320 is about 14887.9253087863. The cubic root of 221650320 is about 605.1868102393.

The spelling of 221650320 in words is "two hundred twenty-one million, six hundred fifty thousand, three hundred twenty".