24505000021 has 2 divisors, whose sum is σ = 24505000022. Its totient is φ = 24505000020.

The previous prime is 24504999887. The next prime is 24505000033. The reversal of 24505000021 is 12000050542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16612632100 + 7892367921 = 128890^2 + 88839^2 .

It is a cyclic number.

It is not a de Polignac number, because 24505000021 - 2¹³ = 24504991829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24505000721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12252500010 + 12252500011.

It is an arithmetic number, because the mean of its divisors is an integer number (12252500011).

Almost surely, 2^24505000021 is an apocalyptic number.

It is an amenable number.

24505000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

24505000021 is an equidigital number, since it uses as much as digits as its factorization.

24505000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

Adding to 24505000021 its reverse (12000050542), we get a palindrome (36505050563).

The spelling of 24505000021 in words is "twenty-four billion, five hundred five million, twenty-one", and thus it is an aban number.