21224241 has 32 divisors (see below), whose sum is σ = 32672640. Its totient is φ = 13608000.

The previous prime is 21224207. The next prime is 21224249. The reversal of 21224241 is 14242212.

It is not a de Polignac number, because 21224241 - 2¹⁵ = 21191473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21224249) 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 31 ways as a sum of consecutive naturals, for example, 117171 + ... + 117351.

It is an arithmetic number, because the mean of its divisors is an integer number (1021020).

Almost surely, 2^21224241 is an apocalyptic number.

It is an amenable number.

21224241 is a deficient number, since it is larger than the sum of its proper divisors (11448399).

21224241 is a wasteful number, since it uses less digits than its factorization.

21224241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 328 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 21224241 is about 4606.9774256013. The cubic root of 21224241 is about 276.8709491091.

Adding to 21224241 its reverse (14242212), we get a palindrome (35466453).

The spelling of 21224241 in words is "twenty-one million, two hundred twenty-four thousand, two hundred forty-one".