Base | Representation |
---|---|
bin | 11001011100010… |
… | …01010001111111 |
3 | 112212121000122010 |
4 | 30232021101333 |
5 | 414114020411 |
6 | 33102222303 |
7 | 5201032110 |
oct | 1456112177 |
9 | 485530563 |
10 | 213423231 |
11 | aa52103a |
12 | 5b584993 |
13 | 352a7048 |
14 | 204b8207 |
15 | 13b0b7a6 |
hex | cb8947f |
213423231 has 16 divisors (see below), whose sum is σ = 329799168. Its totient is φ = 120237600.
The previous prime is 213423229. The next prime is 213423247. The reversal of 213423231 is 132324312.
It is not a de Polignac number, because 213423231 - 21 = 213423229 is a prime.
It is a super-2 number, since 2×2134232312 = 91098951060958722, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (21).
It is a junction number, because it is equal to n+sod(n) for n = 213423198 and 213423207.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (213423271) 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, 70080 + ... + 73061.
It is an arithmetic number, because the mean of its divisors is an integer number (20612448).
Almost surely, 2213423231 is an apocalyptic number.
213423231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.
213423231 is a deficient number, since it is larger than the sum of its proper divisors (116375937).
213423231 is a wasteful number, since it uses less digits than its factorization.
213423231 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 143222.
The product of its digits is 864, while the sum is 21.
The square root of 213423231 is about 14609.0119789122. The cubic root of 213423231 is about 597.6045518856.
Adding to 213423231 its reverse (132324312), we get a palindrome (345747543).
The spelling of 213423231 in words is "two hundred thirteen million, four hundred twenty-three thousand, two hundred thirty-one".
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