21825360749 has 2 divisors, whose sum is σ = 21825360750. Its totient is φ = 21825360748.

The previous prime is 21825360707. The next prime is 21825360769. The reversal of 21825360749 is 94706352812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15057007849 + 6768352900 = 122707^2 + 82270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21825360749 - 2¹⁶ = 21825295213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21825360769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10912680374 + 10912680375.

It is an arithmetic number, because the mean of its divisors is an integer number (10912680375).

It is a 2-persistent number, because it is pandigital, and so is 2⋅21825360749 = 43650721498, but 3⋅21825360749 = 65476082247 is not.

Almost surely, 2^21825360749 is an apocalyptic number.

It is an amenable number.

21825360749 is a deficient number, since it is larger than the sum of its proper divisors (1).

21825360749 is an equidigital number, since it uses as much as digits as its factorization.

21825360749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 21825360749 in words is "twenty-one billion, eight hundred twenty-five million, three hundred sixty thousand, seven hundred forty-nine".