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10205021 = 11818641
BaseRepresentation
bin100110111011…
…011101011101
3201012110122202
4212323131131
510103030041
61002421245
7152512151
oct46733535
921173582
1010205021
115840202
123501825
132163c98
1414d9061
15d68a9b
hex9bb75d

10205021 has 4 divisors (see below), whose sum is σ = 10214844. Its totient is φ = 10195200.

The previous prime is 10205017. The next prime is 10205051. The reversal of 10205021 is 12050201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4468996 + 5736025 = 2114^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 10205021 - 22 = 10205017 is a prime.

It is a super-2 number, since 2×102050212 = 208284907220882, 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 = 10204993 and 10205011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10205011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3140 + ... + 5501.

It is an arithmetic number, because the mean of its divisors is an integer number (2553711).

Almost surely, 210205021 is an apocalyptic number.

It is an amenable number.

10205021 is a deficient number, since it is larger than the sum of its proper divisors (9823).

10205021 is an equidigital number, since it uses as much as digits as its factorization.

10205021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9822.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 10205021 is about 3194.5298558630. The cubic root of 10205021 is about 216.9058678418.

Adding to 10205021 its reverse (12050201), we get a palindrome (22255222).

The spelling of 10205021 in words is "ten million, two hundred five thousand, twenty-one".

Divisors: 1 1181 8641 10205021