24240042221 has 2 divisors, whose sum is σ = 24240042222. Its totient is φ = 24240042220.

The previous prime is 24240042209. The next prime is 24240042247. The reversal of 24240042221 is 12224004242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21959979721 + 2280062500 = 148189^2 + 47750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24240042221 is a prime.

It is a super-2 number, since 2×24240042221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24240042251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12120021110 + 12120021111.

It is an arithmetic number, because the mean of its divisors is an integer number (12120021111).

Almost surely, 2^24240042221 is an apocalyptic number.

It is an amenable number.

24240042221 is a deficient number, since it is larger than the sum of its proper divisors (1).

24240042221 is an equidigital number, since it uses as much as digits as its factorization.

24240042221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 24240042221 its reverse (12224004242), we get a palindrome (36464046463).

The spelling of 24240042221 in words is "twenty-four billion, two hundred forty million, forty-two thousand, two hundred twenty-one".