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21000097 is a prime number
BaseRepresentation
bin101000000011…
…0111110100001
31110111220201101
41100012332201
520334000342
62030034401
7343332526
oct120067641
943456641
1021000097
1110943758
127048a01
1344736c1
142b0914d
151c9c3b7
hex1406fa1

21000097 has 2 divisors, whose sum is σ = 21000098. Its totient is φ = 21000096.

The previous prime is 21000059. The next prime is 21000103. The reversal of 21000097 is 79000012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15124321 + 5875776 = 3889^2 + 2424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21000097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21000037) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500048 + 10500049.

It is an arithmetic number, because the mean of its divisors is an integer number (10500049).

Almost surely, 221000097 is an apocalyptic number.

It is an amenable number.

21000097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000097 is an equidigital number, since it uses as much as digits as its factorization.

21000097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 21000097 is about 4582.5862785113. The cubic root of 21000097 is about 275.8928424242.

The spelling of 21000097 in words is "twenty-one million, ninety-seven", and thus it is an aban number and an uban number.