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221123223 = 3363112979
BaseRepresentation
bin11010010111000…
…01001010010111
3120102002020001000
431023201022113
5423101420343
633535234343
75323342056
oct1513411227
9512066030
10221123223
11103900172
12620789b3
1336a71a59
142152039d
151462ced3
hexd2e1297

221123223 has 16 divisors (see below), whose sum is σ = 328134400. Its totient is φ = 147170520.

The previous prime is 221123213. The next prime is 221123251. The reversal of 221123223 is 322321122.

221123223 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 221123223 - 25 = 221123191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221123196 and 221123205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10548 + ... + 23526.

It is an arithmetic number, because the mean of its divisors is an integer number (20508400).

Almost surely, 2221123223 is an apocalyptic number.

221123223 is a deficient number, since it is larger than the sum of its proper divisors (107011177).

221123223 is a wasteful number, since it uses less digits than its factorization.

221123223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13619 (or 13613 counting only the distinct ones).

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

The square root of 221123223 is about 14870.2126077605. The cubic root of 221123223 is about 604.7067066431.

Adding to 221123223 its reverse (322321122), we get a palindrome (543444345).

The spelling of 221123223 in words is "two hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-three".

Divisors: 1 3 9 27 631 1893 5679 12979 17037 38937 116811 350433 8189749 24569247 73707741 221123223