21144327 has 8 divisors (see below), whose sum is σ = 28242816. Its totient is φ = 14071032.

The previous prime is 21144323. The next prime is 21144341. The reversal of 21144327 is 72344112.

It is a happy number.

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

It is not a de Polignac number, because 21144327 - 2² = 21144323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21144297 and 21144306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4243 + ... + 7764.

It is an arithmetic number, because the mean of its divisors is an integer number (3530352).

Almost surely, 2^21144327 is an apocalyptic number.

21144327 is a deficient number, since it is larger than the sum of its proper divisors (7098489).

21144327 is a wasteful number, since it uses less digits than its factorization.

21144327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12597.

The product of its digits is 1344, while the sum is 24.

The square root of 21144327 is about 4598.2960974691. The cubic root of 21144327 is about 276.5230184439.

Adding to 21144327 its reverse (72344112), we get a palindrome (93488439).

It can be divided in two parts, 2114 and 4327, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 21144327 in words is "twenty-one million, one hundred forty-four thousand, three hundred twenty-seven".