21324377 has 8 divisors (see below), whose sum is σ = 21564264. Its totient is φ = 21086208.

The previous prime is 21324361. The next prime is 21324389. The reversal of 21324377 is 77342312.

It can be written as a sum of positive squares in 4 ways, for example, as 430336 + 20894041 = 656^2 + 4571^2 .

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 21324377 - 2⁴ = 21324361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324977) 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 7 ways as a sum of consecutive naturals, for example, 60233 + ... + 60585.

It is an arithmetic number, because the mean of its divisors is an integer number (2695533).

Almost surely, 2^21324377 is an apocalyptic number.

It is an amenable number.

21324377 is a deficient number, since it is larger than the sum of its proper divisors (239887).

21324377 is a wasteful number, since it uses less digits than its factorization.

21324377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 7056, while the sum is 29.

The square root of 21324377 is about 4617.8325002105. The cubic root of 21324377 is about 277.3056919656.

Adding to 21324377 its reverse (77342312), we get a palindrome (98666689).

The spelling of 21324377 in words is "twenty-one million, three hundred twenty-four thousand, three hundred seventy-seven".