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212221685 = 5134769467
BaseRepresentation
bin11001010011000…
…11111011110101
3112210022222102102
430221203323311
5413312043220
633020351445
75154566054
oct1451437365
9483288372
10212221685
11a9880325
125b0a5585
1334c76180
142028439b
1513970775
hexca63ef5

212221685 has 16 divisors (see below), whose sum is σ = 280094976. Its totient is φ = 153380928.

The previous prime is 212221679. The next prime is 212221687. The reversal of 212221685 is 586122212.

It is not a de Polignac number, because 212221685 - 216 = 212156149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221687) 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 15 ways as a sum of consecutive naturals, for example, 31679 + ... + 37788.

It is an arithmetic number, because the mean of its divisors is an integer number (17505936).

Almost surely, 2212221685 is an apocalyptic number.

It is an amenable number.

212221685 is a deficient number, since it is larger than the sum of its proper divisors (67873291).

212221685 is a wasteful number, since it uses less digits than its factorization.

212221685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69532.

The product of its digits is 3840, while the sum is 29.

The square root of 212221685 is about 14567.8304836376. The cubic root of 212221685 is about 596.4809611449.

Adding to 212221685 its reverse (586122212), we get a palindrome (798343897).

The spelling of 212221685 in words is "two hundred twelve million, two hundred twenty-one thousand, six hundred eighty-five".

Divisors: 1 5 13 47 65 235 611 3055 69467 347335 903071 3264949 4515355 16324745 42444337 212221685