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21042577 is a prime number
BaseRepresentation
bin101000001000…
…1010110010001
31110121001222201
41100101112101
520341330302
62031003201
7343600423
oct120212621
943531881
1021042577
1110972666
127069501
134489b3a
142b1a813
151ca9c87
hex1411591

21042577 has 2 divisors, whose sum is σ = 21042578. Its totient is φ = 21042576.

The previous prime is 21042563. The next prime is 21042601. The reversal of 21042577 is 77524012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11082241 + 9960336 = 3329^2 + 3156^2 .

It is a cyclic number.

It is not a de Polignac number, because 21042577 - 27 = 21042449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21042877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521288 + 10521289.

It is an arithmetic number, because the mean of its divisors is an integer number (10521289).

Almost surely, 221042577 is an apocalyptic number.

It is an amenable number.

21042577 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042577 is an equidigital number, since it uses as much as digits as its factorization.

21042577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 21042577 is about 4587.2188742200. The cubic root of 21042577 is about 276.0787468714.

Adding to 21042577 its reverse (77524012), we get a palindrome (98566589).

The spelling of 21042577 in words is "twenty-one million, forty-two thousand, five hundred seventy-seven".