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221112221 = 1141490271
BaseRepresentation
bin11010010110111…
…10011110011101
3120102001122221112
431023132132131
5423101042341
633535111405
75323265021
oct1513363635
9512048845
10221112221
111038a2980
1262072565
1336a69a45
142151a381
1514629aeb
hexd2de79d

221112221 has 8 divisors (see below), whose sum is σ = 247097088. Its totient is φ = 196108000.

The previous prime is 221112191. The next prime is 221112239. The reversal of 221112221 is 122211122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2k-221112221 is a prime.

It is a super-2 number, since 2×2211122212 = 97781228551105682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221112196 and 221112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244685 + ... + 245586.

It is an arithmetic number, because the mean of its divisors is an integer number (30887136).

Almost surely, 2221112221 is an apocalyptic number.

It is an amenable number.

221112221 is a deficient number, since it is larger than the sum of its proper divisors (25984867).

221112221 is a wasteful number, since it uses less digits than its factorization.

221112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490323.

The product of its digits is 32, while the sum is 14.

The square root of 221112221 is about 14869.8426689727. The cubic root of 221112221 is about 604.6966774032.

Adding to 221112221 its reverse (122211122), we get a palindrome (343323343).

The spelling of 221112221 in words is "two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".

Divisors: 1 11 41 451 490271 5392981 20101111 221112221