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210010221 = 32533971109
BaseRepresentation
bin11001000010010…
…00000001101101
3112122011121212100
430201020001231
5412230311341
632501125313
75130025461
oct1441100155
9478147770
10210010221
11a85aa873
125a3b9839
1334680705
141dc6a4a1
15136853b6
hexc84806d

210010221 has 24 divisors (see below), whose sum is σ = 310129560. Its totient is φ = 136895616.

The previous prime is 210010219. The next prime is 210010247. The reversal of 210010221 is 122010012.

It can be written as a sum of positive squares in 4 ways, for example, as 14402025 + 195608196 = 3795^2 + 13986^2 .

It is not a de Polignac number, because 210010221 - 21 = 210010219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210010201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188815 + ... + 189923.

It is an arithmetic number, because the mean of its divisors is an integer number (12922065).

Almost surely, 2210010221 is an apocalyptic number.

It is an amenable number.

210010221 is a deficient number, since it is larger than the sum of its proper divisors (100119339).

210010221 is a wasteful number, since it uses less digits than its factorization.

210010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1562 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 210010221 is about 14491.7293999026. The cubic root of 210010221 is about 594.4018384256.

Adding to 210010221 its reverse (122010012), we get a palindrome (332020233).

It can be divided in two parts, 2100 and 10221, that added together give a palindrome (12321).

The spelling of 210010221 in words is "two hundred ten million, ten thousand, two hundred twenty-one".

Divisors: 1 3 9 53 159 397 477 1109 1191 3327 3573 9981 21041 58777 63123 176331 189369 440273 528993 1320819 3962457 23334469 70003407 210010221