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12227721 = 311370537
BaseRepresentation
bin101110101001…
…010010001001
3212000020021120
4232221102021
511112241341
61114025453
7205635222
oct56512211
925006246
1012227721
1169a1960
124118289
1326c184c
1418a4249
151118066
hexba9489

12227721 has 8 divisors (see below), whose sum is σ = 17785824. Its totient is φ = 7410720.

The previous prime is 12227711. The next prime is 12227731. The reversal of 12227721 is 12772221.

It is an interprime number because it is at equal distance from previous prime (12227711) and next prime (12227731).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12227721 - 29 = 12227209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12227691 and 12227700.

It is not an unprimeable number, because it can be changed into a prime (12227711) 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 7 ways as a sum of consecutive naturals, for example, 185236 + ... + 185301.

It is an arithmetic number, because the mean of its divisors is an integer number (2223228).

Almost surely, 212227721 is an apocalyptic number.

12227721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12227721 is a deficient number, since it is larger than the sum of its proper divisors (5558103).

12227721 is a wasteful number, since it uses less digits than its factorization.

12227721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370551.

The product of its digits is 784, while the sum is 24.

The square root of 12227721 is about 3496.8158373011. The cubic root of 12227721 is about 230.3819802591.

Adding to 12227721 its reverse (12772221), we get a palindrome (24999942).

The spelling of 12227721 in words is "twelve million, two hundred twenty-seven thousand, seven hundred twenty-one".

Divisors: 1 3 11 33 370537 1111611 4075907 12227721