18811721362227 has 16 divisors (see below), whose sum is σ = 25574720784000. Its totient is φ = 12296056457664.

The previous prime is 18811721362223. The next prime is 18811721362237. The reversal of 18811721362227 is 72226312711881.

It is a happy number.

It is not a de Polignac number, because 18811721362227 - 2² = 18811721362223 is a prime.

It is a super-2 number, since 2×18811721362227² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18811721362227.

It is not an unprimeable number, because it can be changed into a prime (18811721362223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140145202 + ... + 140279367.

It is an arithmetic number, because the mean of its divisors is an integer number (1598420049000).

Almost surely, 2^{18811721362227} is an apocalyptic number.

18811721362227 is a deficient number, since it is larger than the sum of its proper divisors (6762999421773).

18811721362227 is a wasteful number, since it uses less digits than its factorization.

18811721362227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280425010.

The product of its digits is 903168, while the sum is 51.

The spelling of 18811721362227 in words is "eighteen trillion, eight hundred eleven billion, seven hundred twenty-one million, three hundred sixty-two thousand, two hundred twenty-seven".