221250505 has 8 divisors (see below), whose sum is σ = 303429312. Its totient is φ = 151714608.

The previous prime is 221250487. The next prime is 221250511. The reversal of 221250505 is 505052122.

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 221250505 - 2⁹ = 221249993 is a prime.

It is a Duffinian number.

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, 3160687 + ... + 3160756.

It is an arithmetic number, because the mean of its divisors is an integer number (37928664).

Almost surely, 2^221250505 is an apocalyptic number.

It is an amenable number.

221250505 is a deficient number, since it is larger than the sum of its proper divisors (82178807).

221250505 is an equidigital number, since it uses as much as digits as its factorization.

221250505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6321455.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 221250505 is about 14874.4917560231. The cubic root of 221250505 is about 604.8227106139.

The spelling of 221250505 in words is "two hundred twenty-one million, two hundred fifty thousand, five hundred five".