18216821262 has 16 divisors (see below), whose sum is σ = 36774145152. Its totient is φ = 6015523320.

The previous prime is 18216821213. The next prime is 18216821263. The reversal of 18216821262 is 26212861281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18216821262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18216821263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14186914 + ... + 14188197.

It is an arithmetic number, because the mean of its divisors is an integer number (2298384072).

Almost surely, 2^18216821262 is an apocalyptic number.

18216821262 is an abundant number, since it is smaller than the sum of its proper divisors (18557323890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18216821262 is a wasteful number, since it uses less digits than its factorization.

18216821262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28375223.

The product of its digits is 36864, while the sum is 39.

The spelling of 18216821262 in words is "eighteen billion, two hundred sixteen million, eight hundred twenty-one thousand, two hundred sixty-two".