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12212031091 = 13361293311
BaseRepresentation
bin10110101111110010…
…01100111001110011
31011112002002110022211
423113321030321303
5200002234443331
65335442112551
7611424360121
oct132771147163
934462073284
1012212031091
1151a7411787
12244994b757
1311c8072000
1483bc52911
154b71a48b1
hex2d7e4ce73

12212031091 has 32 divisors (see below), whose sum is σ = 13535383680. Its totient is φ = 11014473600.

The previous prime is 12212031077. The next prime is 12212031113. The reversal of 12212031091 is 19013021221.

It is not a de Polignac number, because 12212031091 - 25 = 12212031059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12212031191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39266826 + ... + 39267136.

It is an arithmetic number, because the mean of its divisors is an integer number (422980740).

Almost surely, 212212031091 is an apocalyptic number.

12212031091 is a deficient number, since it is larger than the sum of its proper divisors (1323352589).

12212031091 is an equidigital number, since it uses as much as digits as its factorization.

12212031091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 12212031091 in words is "twelve billion, two hundred twelve million, thirty-one thousand, ninety-one".

Divisors: 1 13 61 169 293 311 793 2197 3809 4043 10309 17873 18971 49517 52559 91123 134017 232349 246623 643721 683267 1184599 3020537 3206099 5558503 15399787 39266981 41679287 72260539 200197231 939387007 12212031091