21530602235369 has 2 divisors, whose sum is σ = 21530602235370. Its totient is φ = 21530602235368.

The previous prime is 21530602235353. The next prime is 21530602235371. The reversal of 21530602235369 is 96353220603512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13085835979225 + 8444766256144 = 3617435^2 + 2905988^2 .

It is a cyclic number.

It is not a de Polignac number, because 21530602235369 - 2⁴ = 21530602235353 is a prime.

It is a super-2 number, since 2×21530602235369² (a number of 27 digits) contains 22 as substring.

Together with 21530602235371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21530602235069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10765301117684 + 10765301117685.

It is an arithmetic number, because the mean of its divisors is an integer number (10765301117685).

Almost surely, 2^{21530602235369} is an apocalyptic number.

It is an amenable number.

21530602235369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21530602235369 is an equidigital number, since it uses as much as digits as its factorization.

21530602235369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 47.

The spelling of 21530602235369 in words is "twenty-one trillion, five hundred thirty billion, six hundred two million, two hundred thirty-five thousand, three hundred sixty-nine".