221624330 has 8 divisors (see below), whose sum is σ = 398923812. Its totient is φ = 88649728.

The previous prime is 221624287. The next prime is 221624353. The reversal of 221624330 is 33426122.

It can be written as a sum of positive squares in 2 ways, for example, as 207388801 + 14235529 = 14401^2 + 3773^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 221624296 and 221624305.

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 3 ways as a sum of consecutive naturals, for example, 11081207 + ... + 11081226.

Almost surely, 2^221624330 is an apocalyptic number.

221624330 is a deficient number, since it is larger than the sum of its proper divisors (177299482).

221624330 is a wasteful number, since it uses less digits than its factorization.

221624330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22162440.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 221624330 is about 14887.0524282008. The cubic root of 221624330 is about 605.1631552317.

The spelling of 221624330 in words is "two hundred twenty-one million, six hundred twenty-four thousand, three hundred thirty".