21094 has 8 divisors (see below), whose sum is σ = 32400. Its totient is φ = 10296.

The previous prime is 21089. The next prime is 21101. The reversal of 21094 is 49012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 5.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7 + ... + 205.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

2²¹⁰⁹⁴ is an apocalyptic number.

21094 is a deficient number, since it is larger than the sum of its proper divisors (11306).

21094 is a wasteful number, since it uses less digits than its factorization.

21094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21094 is about 145.2377361432. The cubic root of 21094 is about 27.6303453959.

The spelling of 21094 in words is "twenty-one thousand, ninety-four".