21027552130369 has 2 divisors, whose sum is σ = 21027552130370. Its totient is φ = 21027552130368.

The previous prime is 21027552130337. The next prime is 21027552130391. The reversal of 21027552130369 is 96303125572012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16263983976769 + 4763568153600 = 4032863^2 + 2182560^2 .

It is a cyclic number.

It is not a de Polignac number, because 21027552130369 - 2⁵ = 21027552130337 is a prime.

It is a super-2 number, since 2×21027552130369² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21027552130309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10513776065184 + 10513776065185.

It is an arithmetic number, because the mean of its divisors is an integer number (10513776065185).

Almost surely, 2^{21027552130369} is an apocalyptic number.

It is an amenable number.

21027552130369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21027552130369 is an equidigital number, since it uses as much as digits as its factorization.

21027552130369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 21027552130369 in words is "twenty-one trillion, twenty-seven billion, five hundred fifty-two million, one hundred thirty thousand, three hundred sixty-nine".