221520232 has 32 divisors (see below), whose sum is σ = 420292800. Its totient is φ = 109450624.

The previous prime is 221520227. The next prime is 221520283. The reversal of 221520232 is 232025122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393183 + ... + 393745.

It is an arithmetic number, because the mean of its divisors is an integer number (13134150).

Almost surely, 2^221520232 is an apocalyptic number.

It is an amenable number.

221520232 is a deficient number, since it is larger than the sum of its proper divisors (198772568).

221520232 is a wasteful number, since it uses less digits than its factorization.

221520232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1061 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 221520232 is about 14883.5557579498. Note that the first 3 decimals coincide. The cubic root of 221520232 is about 605.0683910574.

Adding to 221520232 its reverse (232025122), we get a palindrome (453545354).

The spelling of 221520232 in words is "two hundred twenty-one million, five hundred twenty thousand, two hundred thirty-two".