21324213 has 12 divisors (see below), whose sum is σ = 32423040. Its totient is φ = 13467816.

The previous prime is 21324203. The next prime is 21324221. The reversal of 21324213 is 31242312.

It is not a de Polignac number, because 21324213 - 2⁵ = 21324181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62181 + ... + 62522.

It is an arithmetic number, because the mean of its divisors is an integer number (2701920).

Almost surely, 2^21324213 is an apocalyptic number.

It is an amenable number.

21324213 is a deficient number, since it is larger than the sum of its proper divisors (11098827).

21324213 is a wasteful number, since it uses less digits than its factorization.

21324213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124728 (or 124725 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21324213 is about 4617.8147429277. The cubic root of 21324213 is about 277.3049810695.

Adding to 21324213 its reverse (31242312), we get a palindrome (52566525).

The spelling of 21324213 in words is "twenty-one million, three hundred twenty-four thousand, two hundred thirteen".