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21010111 is a prime number
BaseRepresentation
bin101000000100…
…1011010111111
31110112102110021
41100021122333
520334310421
62030153011
7343403653
oct120113277
943472407
1021010111
1110950231
127052767
134478125
142b0ca63
151ca0341
hex14096bf

21010111 has 2 divisors, whose sum is σ = 21010112. Its totient is φ = 21010110.

The previous prime is 21010097. The next prime is 21010127. The reversal of 21010111 is 11101012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010111 - 27 = 21009983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010094 and 21010103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505055 + 10505056.

It is an arithmetic number, because the mean of its divisors is an integer number (10505056).

Almost surely, 221010111 is an apocalyptic number.

21010111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010111 is an equidigital number, since it uses as much as digits as its factorization.

21010111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 21010111 is about 4583.6787627407. The cubic root of 21010111 is about 275.9366890771.

Adding to 21010111 its reverse (11101012), we get a palindrome (32111123).

Subtracting from 21010111 its reverse (11101012), we obtain a palindrome (9909099).

Multiplying 21010111 by its reverse (11101012), we get a palindrome (233233494332332).

It can be divided in two parts, 2101011 and 1, that added together give a palindrome (2101012).

The spelling of 21010111 in words is "twenty-one million, ten thousand, one hundred eleven".