21324277 has 8 divisors (see below), whose sum is σ = 23242464. Its totient is φ = 19445808.

The previous prime is 21324263. The next prime is 21324283. The reversal of 21324277 is 77242312.

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

It is a cyclic number.

It is not a de Polignac number, because 21324277 - 2¹¹ = 21322229 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 (21324227) 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 7 ways as a sum of consecutive naturals, for example, 8803 + ... + 10960.

It is an arithmetic number, because the mean of its divisors is an integer number (2905308).

Almost surely, 2^21324277 is an apocalyptic number.

It is an amenable number.

21324277 is a deficient number, since it is larger than the sum of its proper divisors (1918187).

21324277 is a wasteful number, since it uses less digits than its factorization.

21324277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19859.

The product of its digits is 4704, while the sum is 28.

The square root of 21324277 is about 4617.8216726071. The cubic root of 21324277 is about 277.3052584928.

Adding to 21324277 its reverse (77242312), we get a palindrome (98566589).

The spelling of 21324277 in words is "twenty-one million, three hundred twenty-four thousand, two hundred seventy-seven".