21808081180183 has 4 divisors (see below), whose sum is σ = 21811533471000. Its totient is φ = 21804628889368.

The previous prime is 21808081180177. The next prime is 21808081180201. The reversal of 21808081180183 is 38108118080812.

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 21808081180183 - 2³³ = 21799491245591 is a prime.

It is a super-2 number, since 2×21808081180183² (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 (21808081130183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1726135933 + ... + 1726148566.

It is an arithmetic number, because the mean of its divisors is an integer number (5452883367750).

Almost surely, 2^{21808081180183} is an apocalyptic number.

21808081180183 is a deficient number, since it is larger than the sum of its proper divisors (3452290817).

21808081180183 is an equidigital number, since it uses as much as digits as its factorization.

21808081180183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452290816.

The product of its (nonzero) digits is 196608, while the sum is 49.

The spelling of 21808081180183 in words is "twenty-one trillion, eight hundred eight billion, eighty-one million, one hundred eighty thousand, one hundred eighty-three".