21163145066653 has 4 divisors (see below), whose sum is σ = 21205218914208. Its totient is φ = 21121071219100.

The previous prime is 21163145066611. The next prime is 21163145066683. The reversal of 21163145066653 is 35666054136112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21163145066653 - 2²⁹ = 21162608195741 is a prime.

It is a super-2 number, since 2×21163145066653² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21163145066597 and 21163145066606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163145066683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21036923023 + ... + 21036924028.

It is an arithmetic number, because the mean of its divisors is an integer number (5301304728552).

Almost surely, 2^{21163145066653} is an apocalyptic number.

It is an amenable number.

21163145066653 is a deficient number, since it is larger than the sum of its proper divisors (42073847555).

21163145066653 is an equidigital number, since it uses as much as digits as its factorization.

21163145066653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42073847554.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 21163145066653 in words is "twenty-one trillion, one hundred sixty-three billion, one hundred forty-five million, sixty-six thousand, six hundred fifty-three".