21034 has 8 divisors (see below), whose sum is σ = 34020. Its totient is φ = 9696.

The previous prime is 21031. The next prime is 21059. The reversal of 21034 is 43012.

It can be written as a sum of positive squares in 2 ways, for example, as 21025 + 9 = 145^2 + 3^2 .

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 nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 21034.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379 + ... + 430.

2²¹⁰³⁴ is an apocalyptic number.

21034 is a deficient number, since it is larger than the sum of its proper divisors (12986).

21034 is a wasteful number, since it uses less digits than its factorization.

21034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21034 is about 145.0310311623. The cubic root of 21034 is about 27.6041231675.

Adding to 21034 its reverse (43012), we get a palindrome (64046).

It can be divided in two parts, 210 and 34, that multiplied together give a triangular number (7140 = T₁₁₉).

The spelling of 21034 in words is "twenty-one thousand, thirty-four".