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23143221 = 322324861
BaseRepresentation
bin101100001001…
…0001100110101
31121112210112100
41120102030311
521411040341
62144012313
7400466643
oct130221465
947483470
1023143221
1112077932
127901099
134a4401a
143106193
1520723b6
hex1612335

23143221 has 18 divisors (see below), whose sum is σ = 34952918. Its totient is φ = 14754960.

The previous prime is 23143199. The next prime is 23143259. The reversal of 23143221 is 12234132.

23143221 is a `hidden beast` number, since 231 + 432 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22667121 + 476100 = 4761^2 + 690^2 .

It is not a de Polignac number, because 23143221 - 217 = 23012149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23143194 and 23143203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23143261) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 2331 + ... + 7191.

It is a self-describing number.

Almost surely, 223143221 is an apocalyptic number.

It is an amenable number.

23143221 is a deficient number, since it is larger than the sum of its proper divisors (11809697).

23143221 is a wasteful number, since it uses less digits than its factorization.

23143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4913 (or 4887 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 23143221 is about 4810.7401717407. The cubic root of 23143221 is about 284.9757689464.

Adding to 23143221 its reverse (12234132), we get a palindrome (35377353).

The spelling of 23143221 in words is "twenty-three million, one hundred forty-three thousand, two hundred twenty-one".

Divisors: 1 3 9 23 69 207 529 1587 4761 4861 14583 43749 111803 335409 1006227 2571469 7714407 23143221