Search a number
-
+
212323221 = 3311714893
BaseRepresentation
bin11001010011111…
…00101110010101
3112210112010201000
430221330232111
5413323320341
633022453513
75155501065
oct1451745625
9483463630
10212323221
11a993a640
125b134299
1334cb0456
14202ad3a5
15139908b6
hexca7cb95

212323221 has 16 divisors (see below), whose sum is σ = 343149120. Its totient is φ = 128680560.

The previous prime is 212323219. The next prime is 212323229. The reversal of 212323221 is 122323212.

It is not a de Polignac number, because 212323221 - 21 = 212323219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212323194 and 212323203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212323229) 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, 357150 + ... + 357743.

It is an arithmetic number, because the mean of its divisors is an integer number (21446820).

Almost surely, 2212323221 is an apocalyptic number.

It is an amenable number.

212323221 is a deficient number, since it is larger than the sum of its proper divisors (130825899).

212323221 is a wasteful number, since it uses less digits than its factorization.

212323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714913 (or 714907 counting only the distinct ones).

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

The square root of 212323221 is about 14571.3150058600. The cubic root of 212323221 is about 596.5760733771.

Adding to 212323221 its reverse (122323212), we get a palindrome (334646433).

Subtracting from 212323221 its reverse (122323212), we obtain a palindrome (90000009).

The spelling of 212323221 in words is "two hundred twelve million, three hundred twenty-three thousand, two hundred twenty-one".

Divisors: 1 3 9 11 27 33 99 297 714893 2144679 6434037 7863823 19302111 23591469 70774407 212323221