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21020041 = 717296091
BaseRepresentation
bin101000000101…
…1110110001001
31110112221002001
41100023312021
520340120131
62030311001
7343444630
oct120136611
943487061
1021020041
1110957739
127058461
13447c7c3
142b12517
151ca3261
hex140bd89

21020041 has 16 divisors (see below), whose sum is σ = 26317440. Its totient is φ = 16369920.

The previous prime is 21020039. The next prime is 21020053. The reversal of 21020041 is 14002012.

Adding to 21020041 its reverse (14002012), we get a palindrome (35022053).

It is not a de Polignac number, because 21020041 - 21 = 21020039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406 + ... + 6496.

It is an arithmetic number, because the mean of its divisors is an integer number (1644840).

Almost surely, 221020041 is an apocalyptic number.

It is an amenable number.

21020041 is a deficient number, since it is larger than the sum of its proper divisors (5297399).

21020041 is a wasteful number, since it uses less digits than its factorization.

21020041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6144.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21020041 is about 4584.7618258749. The cubic root of 21020041 is about 275.9801541776.

The spelling of 21020041 in words is "twenty-one million, twenty thousand, forty-one".

Divisors: 1 7 17 29 119 203 493 3451 6091 42637 103547 176639 724829 1236473 3002863 21020041