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12121212220 = 2251346620047
BaseRepresentation
bin10110100100111101…
…10000010100111100
31011021202012101020221
423102132300110330
5144311012242340
65322435351124
7606242414065
oct132236602474
934252171227
1012121212220
115160121167
1224234524a4
1311b22c4430
1482db7156c
154ae21544a
hex2d27b053c

12121212220 has 24 divisors (see below), whose sum is σ = 27412588224. Its totient is φ = 4475524416.

The previous prime is 12121212209. The next prime is 12121212223. The reversal of 12121212220 is 2221212121.

It is a happy number.

12121212220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12121212194 and 12121212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121212223) 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 7 ways as a sum of consecutive naturals, for example, 23309764 + ... + 23310283.

It is an arithmetic number, because the mean of its divisors is an integer number (1142191176).

Almost surely, 212121212220 is an apocalyptic number.

12121212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121212220 is an abundant number, since it is smaller than the sum of its proper divisors (15291376004).

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

12121212220 is a wasteful number, since it uses less digits than its factorization.

12121212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46620069 (or 46620067 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12121212220 its reverse (2221212121), we get a palindrome (14342424341).

Subtracting from 12121212220 its reverse (2221212121), we obtain a palindrome (9900000099).

The spelling of 12121212220 in words is "twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty".

Divisors: 1 2 4 5 10 13 20 26 52 65 130 260 46620047 93240094 186480188 233100235 466200470 606060611 932400940 1212121222 2424242444 3030303055 6060606110 12121212220