21214 has 4 divisors (see below), whose sum is σ = 31824. Its totient is φ = 10606.

The previous prime is 21211. The next prime is 21221. The reversal of 21214 is 41212.

It is a semiprime because it is the product of two primes.

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

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 21214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302 + ... + 5305.

It is an arithmetic number, because the mean of its divisors is an integer number (7956).

2²¹²¹⁴ is an apocalyptic number.

21214 is a deficient number, since it is larger than the sum of its proper divisors (10610).

21214 is a wasteful number, since it uses less digits than its factorization.

21214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10609.

The product of its digits is 16, while the sum is 10.

The square root of 21214 is about 145.6502660485. The cubic root of 21214 is about 27.6826410546.

Adding to 21214 its reverse (41212), we get a palindrome (62426).

The spelling of 21214 in words is "twenty-one thousand, two hundred fourteen", and thus it is an iban number.