21043130525269 has 2 divisors, whose sum is σ = 21043130525270. Its totient is φ = 21043130525268.

The previous prime is 21043130525119. The next prime is 21043130525401. The reversal of 21043130525269 is 96252503134012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13632414684100 + 7410715841169 = 3692210^2 + 2722263^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043130525269 - 2²¹ = 21043128428117 is a prime.

It is a super-2 number, since 2×21043130525269² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043130525869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521565262634 + 10521565262635.

It is an arithmetic number, because the mean of its divisors is an integer number (10521565262635).

Almost surely, 2^{21043130525269} is an apocalyptic number.

It is an amenable number.

21043130525269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043130525269 is an equidigital number, since it uses as much as digits as its factorization.

21043130525269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 21043130525269 in words is "twenty-one trillion, forty-three billion, one hundred thirty million, five hundred twenty-five thousand, two hundred sixty-nine".