21143326 has 8 divisors (see below), whose sum is σ = 32389920. Its totient is φ = 10346688.

The previous prime is 21143293. The next prime is 21143327. The reversal of 21143326 is 62334112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21143297 and 21143306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112371 + ... + 112558.

It is an arithmetic number, because the mean of its divisors is an integer number (4048740).

Almost surely, 2^21143326 is an apocalyptic number.

21143326 is a deficient number, since it is larger than the sum of its proper divisors (11246594).

21143326 is a wasteful number, since it uses less digits than its factorization.

21143326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224978.

The product of its digits is 864, while the sum is 22.

The square root of 21143326 is about 4598.1872515155. The cubic root of 21143326 is about 276.5186547216.

Adding to 21143326 its reverse (62334112), we get a palindrome (83477438).

The spelling of 21143326 in words is "twenty-one million, one hundred forty-three thousand, three hundred twenty-six".