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12212221212 = 22322417140351
BaseRepresentation
bin10110101111110011…
…11011010100011100
31011112002110010010100
423113321323110130
5200002312034322
65335450141100
7611426111322
oct132771732434
934462403110
1012212221212
1151a7531604
122449a21790
1311c810a6c9
1483bca1d12
154b71e0dac
hex2d7e7b51c

12212221212 has 36 divisors (see below), whose sum is σ = 30882773376. Its totient is φ = 4069027200.

The previous prime is 12212221193. The next prime is 12212221213. The reversal of 12212221212 is 21212221221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212221213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16837 + ... + 157187.

It is an arithmetic number, because the mean of its divisors is an integer number (857854816).

Almost surely, 212212221212 is an apocalyptic number.

12212221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12212221212 is an abundant number, since it is smaller than the sum of its proper divisors (18670552164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12212221212 is a wasteful number, since it uses less digits than its factorization.

12212221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142778 (or 142773 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 12212221212 its reverse (21212221221), we get a palindrome (33424442433).

Subtracting 12212221212 from its reverse (21212221221), we obtain a palindrome (9000000009).

The spelling of 12212221212 in words is "twelve billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twelve".

Divisors: 1 2 3 4 6 9 12 18 36 2417 4834 7251 9668 14502 21753 29004 43506 87012 140351 280702 421053 561404 842106 1263159 1684212 2526318 5052636 339228367 678456734 1017685101 1356913468 2035370202 3053055303 4070740404 6106110606 12212221212