24551042221 has 2 divisors, whose sum is σ = 24551042222. Its totient is φ = 24551042220.

The previous prime is 24551042209. The next prime is 24551042281. The reversal of 24551042221 is 12224015542.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23488934121 + 1062108100 = 153261^2 + 32590^2 .

It is a cyclic number.

It is not a de Polignac number, because 24551042221 - 2⁵ = 24551042189 is a prime.

It is a super-2 number, since 2×24551042221² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 24551042221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24551042281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12275521110 + 12275521111.

It is an arithmetic number, because the mean of its divisors is an integer number (12275521111).

Almost surely, 2^24551042221 is an apocalyptic number.

It is an amenable number.

24551042221 is a deficient number, since it is larger than the sum of its proper divisors (1).

24551042221 is an equidigital number, since it uses as much as digits as its factorization.

24551042221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 24551042221 its reverse (12224015542), we get a palindrome (36775057763).

The spelling of 24551042221 in words is "twenty-four billion, five hundred fifty-one million, forty-two thousand, two hundred twenty-one".