221887265 has 16 divisors (see below), whose sum is σ = 276382800. Its totient is φ = 170806272.

The previous prime is 221887241. The next prime is 221887273. The reversal of 221887265 is 562788122.

It can be written as a sum of positive squares in 8 ways, for example, as 20502784 + 201384481 = 4528^2 + 14191^2 .

It is a cyclic number.

It is not a de Polignac number, because 221887265 - 2¹⁰ = 221886241 is a prime.

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, 42941 + ... + 47829.

It is an arithmetic number, because the mean of its divisors is an integer number (17273925).

Almost surely, 2^221887265 is an apocalyptic number.

It is an amenable number.

221887265 is a deficient number, since it is larger than the sum of its proper divisors (54495535).

221887265 is a wasteful number, since it uses less digits than its factorization.

221887265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5236.

The product of its digits is 107520, while the sum is 41.

The square root of 221887265 is about 14895.8808064512. The cubic root of 221887265 is about 605.4023824104.

The spelling of 221887265 in words is "two hundred twenty-one million, eight hundred eighty-seven thousand, two hundred sixty-five".