21324121 has 8 divisors (see below), whose sum is σ = 26245184. Its totient is φ = 16871760.

The previous prime is 21324119. The next prime is 21324139. The reversal of 21324121 is 12142312.

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 21324121 - 2¹ = 21324119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21324095 and 21324104.

It is not an unprimeable number, because it can be changed into a prime (21324101) 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, 117075 + ... + 117256.

It is an arithmetic number, because the mean of its divisors is an integer number (3280648).

Almost surely, 2^21324121 is an apocalyptic number.

It is an amenable number.

21324121 is a deficient number, since it is larger than the sum of its proper divisors (4921063).

21324121 is a wasteful number, since it uses less digits than its factorization.

21324121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234351.

The product of its digits is 96, while the sum is 16.

The square root of 21324121 is about 4617.8047814952. The cubic root of 21324121 is about 277.3045822726.

Adding to 21324121 its reverse (12142312), we get a palindrome (33466433).

The spelling of 21324121 in words is "twenty-one million, three hundred twenty-four thousand, one hundred twenty-one".