221425505 has 8 divisors (see below), whose sum is σ = 303669312. Its totient is φ = 151834608.

The previous prime is 221425483. The next prime is 221425511. The reversal of 221425505 is 505524122.

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

It is a cyclic number.

It is not a de Polignac number, because 221425505 - 2⁶ = 221425441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3163187 + ... + 3163256.

It is an arithmetic number, because the mean of its divisors is an integer number (37958664).

Almost surely, 2^221425505 is an apocalyptic number.

It is an amenable number.

221425505 is a deficient number, since it is larger than the sum of its proper divisors (82243807).

221425505 is an equidigital number, since it uses as much as digits as its factorization.

221425505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6326455.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 221425505 is about 14880.3731472030. The cubic root of 221425505 is about 604.9821318403.

Adding to 221425505 its reverse (505524122), we get a palindrome (726949627).

The spelling of 221425505 in words is "two hundred twenty-one million, four hundred twenty-five thousand, five hundred five".