21145502345369 has 2 divisors, whose sum is σ = 21145502345370. Its totient is φ = 21145502345368.

The previous prime is 21145502345321. The next prime is 21145502345423. The reversal of 21145502345369 is 96354320554112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20445201159769 + 700301185600 = 4521637^2 + 836840^2 .

It is a cyclic number.

It is not a de Polignac number, because 21145502345369 - 2²⁸ = 21145233909913 is a prime.

It is a super-2 number, since 2×21145502345369² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21145502345269) 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, 10572751172684 + 10572751172685.

It is an arithmetic number, because the mean of its divisors is an integer number (10572751172685).

Almost surely, 2^{21145502345369} is an apocalyptic number.

It is an amenable number.

21145502345369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145502345369 is an equidigital number, since it uses as much as digits as its factorization.

21145502345369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 21145502345369 in words is "twenty-one trillion, one hundred forty-five billion, five hundred two million, three hundred forty-five thousand, three hundred sixty-nine".