21244327 has 16 divisors (see below), whose sum is σ = 24323040. Its totient is φ = 18410112.

The previous prime is 21244309. The next prime is 21244367. The reversal of 21244327 is 72344212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21244327 - 2⁷ = 21244199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13188 + ... + 14710.

It is an arithmetic number, because the mean of its divisors is an integer number (1520190).

Almost surely, 2^21244327 is an apocalyptic number.

21244327 is a deficient number, since it is larger than the sum of its proper divisors (3078713).

21244327 is a wasteful number, since it uses less digits than its factorization.

21244327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602.

The product of its digits is 2688, while the sum is 25.

The square root of 21244327 is about 4609.1568643300. The cubic root of 21244327 is about 276.9582624234.

Adding to 21244327 its reverse (72344212), we get a palindrome (93588539).

The spelling of 21244327 in words is "twenty-one million, two hundred forty-four thousand, three hundred twenty-seven".