21274 has 8 divisors (see below), whose sum is σ = 34848. Its totient is φ = 9660.

The previous prime is 21269. The next prime is 21277. The reversal of 21274 is 47212.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277) by changing a digit.

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, 462 + ... + 505.

It is an arithmetic number, because the mean of its divisors is an integer number (4356).

2²¹²⁷⁴ is an apocalyptic number.

21274 is a deficient number, since it is larger than the sum of its proper divisors (13574).

21274 is a wasteful number, since it uses less digits than its factorization.

21274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its digits is 112, while the sum is 16.

The square root of 21274 is about 145.8560934620. The cubic root of 21274 is about 27.7087149526.

Adding to 21274 its reverse (47212), we get a palindrome (68486).

The spelling of 21274 in words is "twenty-one thousand, two hundred seventy-four", and thus it is an iban number.