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21006550 = 252537927
BaseRepresentation
bin101000000100…
…0100011010110
31110112020120101
41100020203112
520334202200
62030124314
7343360405
oct120104326
943466511
1021006550
1110948594
12705069a
134476616
142b0b63c
151c9e26a
hex14088d6

21006550 has 24 divisors (see below), whose sum is σ = 39814416. Its totient is φ = 8243040.

The previous prime is 21006547. The next prime is 21006551. The reversal of 21006550 is 5560012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1314 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (1658934).

Almost surely, 221006550 is an apocalyptic number.

21006550 is a deficient number, since it is larger than the sum of its proper divisors (18807866).

21006550 is a wasteful number, since it uses less digits than its factorization.

21006550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7992 (or 7987 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21006550 is about 4583.2903028283. The cubic root of 21006550 is about 275.9210987093.

Adding to 21006550 its reverse (5560012), we get a palindrome (26566562).

The spelling of 21006550 in words is "twenty-one million, six thousand, five hundred fifty".

Divisors: 1 2 5 10 25 50 53 106 265 530 1325 2650 7927 15854 39635 79270 198175 396350 420131 840262 2100655 4201310 10503275 21006550