24380221 has 2 divisors, whose sum is σ = 24380222. Its totient is φ = 24380220.

The previous prime is 24380219. The next prime is 24380231. The reversal of 24380221 is 12208342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15912121 + 8468100 = 3989^2 + 2910^2 .

It is a cyclic number.

It is not a de Polignac number, because 24380221 - 2¹ = 24380219 is a prime.

Together with 24380219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 24380192 and 24380201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24380201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12190110 + 12190111.

It is an arithmetic number, because the mean of its divisors is an integer number (12190111).

Almost surely, 2^24380221 is an apocalyptic number.

It is an amenable number.

24380221 is a deficient number, since it is larger than the sum of its proper divisors (1).

24380221 is an equidigital number, since it uses as much as digits as its factorization.

24380221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 24380221 is about 4937.6331374455. The cubic root of 24380221 is about 289.9651999462.

Adding to 24380221 its reverse (12208342), we get a palindrome (36588563).

The spelling of 24380221 in words is "twenty-four million, three hundred eighty thousand, two hundred twenty-one".