21146 has 8 divisors (see below), whose sum is σ = 32340. Its totient is φ = 10368.

The previous prime is 21143. The next prime is 21149. The reversal of 21146 is 64112.

It is an interprime number because it is at equal distance from previous prime (21143) and next prime (21149).

It can be written as a sum of positive squares in 2 ways, for example, as 21025 + 121 = 145^2 + 11^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21146.

It is not an unprimeable number, because it can be changed into a prime (21143) 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, 140 + ... + 248.

2²¹¹⁴⁶ is an apocalyptic number.

21146 is a deficient number, since it is larger than the sum of its proper divisors (11194).

21146 is a wasteful number, since it uses less digits than its factorization.

21146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208.

The product of its digits is 48, while the sum is 14.

The square root of 21146 is about 145.4166427889. The cubic root of 21146 is about 27.6530311351.

Adding to 21146 its reverse (64112), we get a palindrome (85258).

The spelling of 21146 in words is "twenty-one thousand, one hundred forty-six".