21302533132165 has 16 divisors (see below), whose sum is σ = 27090021319488. Its totient is φ = 16025762749696.

The previous prime is 21302533132117. The next prime is 21302533132171. The reversal of 21302533132165 is 56123133520312.

It is a cyclic number.

It is not a de Polignac number, because 21302533132165 - 2⁷ = 21302533132037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107647507 + ... + 107845216.

It is an arithmetic number, because the mean of its divisors is an integer number (1693126332468).

Almost surely, 2^{21302533132165} is an apocalyptic number.

It is an amenable number.

21302533132165 is a deficient number, since it is larger than the sum of its proper divisors (5787488187323).

21302533132165 is a wasteful number, since it uses less digits than its factorization.

21302533132165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215493908.

The product of its (nonzero) digits is 97200, while the sum is 37.

Adding to 21302533132165 its reverse (56123133520312), we get a palindrome (77425666652477).

The spelling of 21302533132165 in words is "twenty-one trillion, three hundred two billion, five hundred thirty-three million, one hundred thirty-two thousand, one hundred sixty-five".