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221225265 = 32519258743
BaseRepresentation
bin11010010111110…
…10000100110001
3120102021102000100
431023322010301
5423113202030
633541343013
75324245422
oct1513720461
9512242010
10221225265
1110396a8a8
1262107a69
1336aa9331
1421549649
151464d360
hexd2fa131

221225265 has 24 divisors (see below), whose sum is σ = 403640640. Its totient is φ = 111776544.

The previous prime is 221225209. The next prime is 221225309. The reversal of 221225265 is 562522122.

221225265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221225265 - 28 = 221225009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128517 + ... + 130226.

It is an arithmetic number, because the mean of its divisors is an integer number (16818360).

Almost surely, 2221225265 is an apocalyptic number.

It is an amenable number.

221225265 is a deficient number, since it is larger than the sum of its proper divisors (182415375).

221225265 is a wasteful number, since it uses less digits than its factorization.

221225265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258773 (or 258770 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 221225265 is about 14873.6432994744. The cubic root of 221225265 is about 604.7997105824.

Adding to 221225265 its reverse (562522122), we get a palindrome (783747387).

The spelling of 221225265 in words is "two hundred twenty-one million, two hundred twenty-five thousand, two hundred sixty-five".

Divisors: 1 3 5 9 15 19 45 57 95 171 285 855 258743 776229 1293715 2328687 3881145 4916117 11643435 14748351 24580585 44245053 73741755 221225265