21419 has 2 divisors, whose sum is σ = 21420. Its totient is φ = 21418.
The previous prime is 21407. The next prime is 21433. The reversal of 21419 is 91412.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 21419 - 28 = 21163 is a prime.
It is a super-2 number, since 2×214192 = 917547122, which contains 22 as substring.
It is a Sophie Germain prime.
It is a Chen prime.
It is a nialpdrome in base 13.
It is a junction number, because it is equal to n+sod(n) for n = 21397 and 21406.
It is not a weakly prime, because it can be changed into another prime (21499) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10709 + 10710.
It is an arithmetic number, because the mean of its divisors is an integer number (10710).
221419 is an apocalyptic number.
21419 is a deficient number, since it is larger than the sum of its proper divisors (1).
21419 is an equidigital number, since it uses as much as digits as its factorization.
21419 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 72, while the sum is 17.
The square root of 21419 is about 146.3523146383. The cubic root of 21419 is about 27.7715251112.
The spelling of 21419 in words is "twenty-one thousand, four hundred nineteen".
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