221440434 has 32 divisors (see below), whose sum is σ = 447897600. Its totient is φ = 72982800.

The previous prime is 221440423. The next prime is 221440447. The reversal of 221440434 is 434044122.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227569 + ... + 228539.

It is an arithmetic number, because the mean of its divisors is an integer number (13996800).

Almost surely, 2^221440434 is an apocalyptic number.

221440434 is an abundant number, since it is smaller than the sum of its proper divisors (226457166).

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

221440434 is a wasteful number, since it uses less digits than its factorization.

221440434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 221440434 is about 14880.8747726738. The cubic root of 221440434 is about 604.9957279483.

Adding to 221440434 its reverse (434044122), we get a palindrome (655484556).

The spelling of 221440434 in words is "two hundred twenty-one million, four hundred forty thousand, four hundred thirty-four".