21324514 has 4 divisors (see below), whose sum is σ = 31986774. Its totient is φ = 10662256.

The previous prime is 21324509. The next prime is 21324529. The reversal of 21324514 is 41542312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 667489 = 4545^2 + 817^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5331127 + ... + 5331130.

Almost surely, 2^21324514 is an apocalyptic number.

21324514 is a deficient number, since it is larger than the sum of its proper divisors (10662260).

21324514 is a wasteful number, since it uses less digits than its factorization.

21324514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10662259.

The product of its digits is 960, while the sum is 22.

The square root of 21324514 is about 4617.8473339858. The cubic root of 21324514 is about 277.3062858212.

Adding to 21324514 its reverse (41542312), we get a palindrome (62866826).

The spelling of 21324514 in words is "twenty-one million, three hundred twenty-four thousand, five hundred fourteen".