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12231211221 = 3317191402501
BaseRepresentation
bin10110110010000100…
…10111100011010101
31011120102011220112000
423121002113203111
5200022142224341
65341405145513
7612046402635
oct133102274325
934512156460
1012231211221
115207222029
12245425b299
1311cc0291b8
148406066c5
154b8be28b6
hex2d90978d5

12231211221 has 32 divisors (see below), whose sum is σ = 20196028800. Its totient is φ = 7270560000.

The previous prime is 12231211219. The next prime is 12231211241. The reversal of 12231211221 is 12211213221.

12231211221 is a `hidden beast` number, since 1 + 2 + 231 + 211 + 221 = 666.

12231211221 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 12231211221 - 21 = 12231211219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12231211194 and 12231211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231211241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 692530 + ... + 709971.

It is an arithmetic number, because the mean of its divisors is an integer number (631125900).

Almost surely, 212231211221 is an apocalyptic number.

It is an amenable number.

12231211221 is a deficient number, since it is larger than the sum of its proper divisors (7964817579).

12231211221 is a wasteful number, since it uses less digits than its factorization.

12231211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402546 (or 1402540 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 12231211221 its reverse (12211213221), we get a palindrome (24442424442).

The spelling of 12231211221 in words is "twelve billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twenty-one".

Divisors: 1 3 9 17 19 27 51 57 153 171 323 459 513 969 2907 8721 1402501 4207503 12622509 23842517 26647519 37867527 71527551 79942557 214582653 239827671 453007823 643747959 719483013 1359023469 4077070407 12231211221