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21058819 is a prime number
BaseRepresentation
bin101000001010…
…1010100000011
31110121220021021
41100111110003
520342340234
62031210311
7343665655
oct120252403
943556237
1021058819
1110983891
127076997
134494352
142b226d5
151cae9b4
hex1415503

21058819 has 2 divisors, whose sum is σ = 21058820. Its totient is φ = 21058818.

The previous prime is 21058787. The next prime is 21058853. The reversal of 21058819 is 91885012.

It is an a-pointer prime, because the next prime (21058853) can be obtained adding 21058819 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21058819 - 25 = 21058787 is a prime.

It is a super-2 number, since 2×210588192 = 886947715349522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21058619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529409 + 10529410.

It is an arithmetic number, because the mean of its divisors is an integer number (10529410).

Almost surely, 221058819 is an apocalyptic number.

21058819 is a deficient number, since it is larger than the sum of its proper divisors (1).

21058819 is an equidigital number, since it uses as much as digits as its factorization.

21058819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 21058819 is about 4588.9888864542. The cubic root of 21058819 is about 276.1497603188.

The spelling of 21058819 in words is "twenty-one million, fifty-eight thousand, eight hundred nineteen".