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21101849 is a prime number
BaseRepresentation
bin101000001111…
…1110100011001
31110201002021222
41100133310121
520400224344
62032141425
7344235266
oct120376431
943632258
1021101849
1110a0314a
127097875
1344aab02
142b3426d
151cbc5ee
hex141fd19

21101849 has 2 divisors, whose sum is σ = 21101850. Its totient is φ = 21101848.

The previous prime is 21101819. The next prime is 21101867. The reversal of 21101849 is 94810112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20866624 + 235225 = 4568^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101849 - 212 = 21097753 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21101809) 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, 10550924 + 10550925.

It is an arithmetic number, because the mean of its divisors is an integer number (10550925).

Almost surely, 221101849 is an apocalyptic number.

It is an amenable number.

21101849 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101849 is an equidigital number, since it uses as much as digits as its factorization.

21101849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 21101849 is about 4593.6748905424. The cubic root of 21101849 is about 276.3377202093.

The spelling of 21101849 in words is "twenty-one million, one hundred one thousand, eight hundred forty-nine".