24121221 has 4 divisors (see below), whose sum is σ = 32161632. Its totient is φ = 16080812.

The previous prime is 24121219. The next prime is 24121231. The reversal of 24121221 is 12212142.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 24121221 - 2¹ = 24121219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 24121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24121231) 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 3 ways as a sum of consecutive naturals, for example, 4020201 + ... + 4020206.

It is an arithmetic number, because the mean of its divisors is an integer number (8040408).

Almost surely, 2^24121221 is an apocalyptic number.

It is an amenable number.

24121221 is a deficient number, since it is larger than the sum of its proper divisors (8040411).

24121221 is an equidigital number, since it uses as much as digits as its factorization.

24121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8040410.

The product of its digits is 64, while the sum is 15.

The square root of 24121221 is about 4911.3359689600. The cubic root of 24121221 is about 288.9347401965.

Adding to 24121221 its reverse (12212142), we get a palindrome (36333363).

It can be divided in two parts, 24121 and 221, that added together give a palindrome (24342).

The spelling of 24121221 in words is "twenty-four million, one hundred twenty-one thousand, two hundred twenty-one".