21119 has 6 divisors (see below), whose sum is σ = 24624. Its totient is φ = 18060.

The previous prime is 21107. The next prime is 21121. The reversal of 21119 is 91112.

It is a de Polignac number, because none of the positive numbers 2^k-21119 is a prime.

It is a super-2 number, since 2×21119² = 892024322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 167 + ... + 264.

It is an arithmetic number, because the mean of its divisors is an integer number (4104).

2²¹¹¹⁹ is an apocalyptic number.

21119 is a deficient number, since it is larger than the sum of its proper divisors (3505).

21119 is an equidigital number, since it uses as much as digits as its factorization.

21119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 438 counting only the distinct ones).

The product of its digits is 18, while the sum is 14.

The square root of 21119 is about 145.3237764442. The cubic root of 21119 is about 27.6412566491.

The spelling of 21119 in words is "twenty-one thousand, one hundred nineteen".