21825727069 has 2 divisors, whose sum is σ = 21825727070. Its totient is φ = 21825727068.

The previous prime is 21825727067. The next prime is 21825727073. The reversal of 21825727069 is 96072752812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18289046169 + 3536680900 = 135237^2 + 59470^2 .

It is a cyclic number.

It is not a de Polignac number, because 21825727069 - 2¹ = 21825727067 is a prime.

It is a super-2 number, since 2×21825727069² (a number of 21 digits) contains 22 as substring.

Together with 21825727067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21825727067) 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, 10912863534 + 10912863535.

It is an arithmetic number, because the mean of its divisors is an integer number (10912863535).

Almost surely, 2^21825727069 is an apocalyptic number.

It is an amenable number.

21825727069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21825727069 is an equidigital number, since it uses as much as digits as its factorization.

21825727069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 21825727069 in words is "twenty-one billion, eight hundred twenty-five million, seven hundred twenty-seven thousand, sixty-nine".