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21019393 is a prime number
BaseRepresentation
bin101000000101…
…1101100000001
31110112220012001
41100023230001
520340110033
62030304001
7343443013
oct120135401
943486161
1021019393
11109571aa
127058001
13447c415
142b121b3
151ca2e7d
hex140bb01

21019393 has 2 divisors, whose sum is σ = 21019394. Its totient is φ = 21019392.

The previous prime is 21019381. The next prime is 21019409. The reversal of 21019393 is 39391012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13927824 + 7091569 = 3732^2 + 2663^2 .

It is a cyclic number.

It is not a de Polignac number, because 21019393 - 217 = 20888321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21019363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509696 + 10509697.

It is an arithmetic number, because the mean of its divisors is an integer number (10509697).

Almost surely, 221019393 is an apocalyptic number.

It is an amenable number.

21019393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019393 is an equidigital number, since it uses as much as digits as its factorization.

21019393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 21019393 is about 4584.6911564466. The cubic root of 21019393 is about 275.9773182019.

It can be divided in two parts, 21019 and 393, that added together give a palindrome (21412).

The spelling of 21019393 in words is "twenty-one million, nineteen thousand, three hundred ninety-three".