24854985821 has 2 divisors, whose sum is σ = 24854985822. Its totient is φ = 24854985820.

The previous prime is 24854985797. The next prime is 24854985829. The reversal of 24854985821 is 12858945842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14585392900 + 10269592921 = 120770^2 + 101339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24854985821 is a prime.

It is a super-2 number, since 2×24854985821² (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 (24854985829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12427492910 + 12427492911.

It is an arithmetic number, because the mean of its divisors is an integer number (12427492911).

Almost surely, 2^24854985821 is an apocalyptic number.

It is an amenable number.

24854985821 is a deficient number, since it is larger than the sum of its proper divisors (1).

24854985821 is an equidigital number, since it uses as much as digits as its factorization.

24854985821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7372800, while the sum is 56.

The spelling of 24854985821 in words is "twenty-four billion, eight hundred fifty-four million, nine hundred eighty-five thousand, eight hundred twenty-one".