21808606182263 has 4 divisors (see below), whose sum is σ = 21810613058520. Its totient is φ = 21806599306008.

The previous prime is 21808606182257. The next prime is 21808606182277. The reversal of 21808606182263 is 36228160680812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21808606182263 - 2¹⁰ = 21808606181239 is a prime.

It is a super-2 number, since 2×21808606182263² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21808606182283) 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, 1003421828 + ... + 1003443561.

It is an arithmetic number, because the mean of its divisors is an integer number (5452653264630).

Almost surely, 2^{21808606182263} is an apocalyptic number.

21808606182263 is a deficient number, since it is larger than the sum of its proper divisors (2006876257).

21808606182263 is a wasteful number, since it uses less digits than its factorization.

21808606182263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006876256.

The product of its (nonzero) digits is 2654208, while the sum is 53.

The spelling of 21808606182263 in words is "twenty-one trillion, eight hundred eight billion, six hundred six million, one hundred eighty-two thousand, two hundred sixty-three".