18213227220006 has 144 divisors (see below), whose sum is σ = 49441384936944. Its totient is φ = 4802955792768.

The previous prime is 18213227219977. The next prime is 18213227220059. The reversal of 18213227220006 is 60002272231281.

18213227220006 is a `hidden beast` number, since 18 + 213 + 227 + 2 + 200 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 109222065 + ... + 109388691.

It is an arithmetic number, because the mean of its divisors is an integer number (343342950951).

Almost surely, 2^{18213227220006} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18213227220006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24720692468472).

18213227220006 is an abundant number, since it is smaller than the sum of its proper divisors (31228157716938).

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

18213227220006 is a wasteful number, since it uses less digits than its factorization.

18213227220006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176195 (or 176185 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

Adding to 18213227220006 its reverse (60002272231281), we get a palindrome (78215499451287).

The spelling of 18213227220006 in words is "eighteen trillion, two hundred thirteen billion, two hundred twenty-seven million, two hundred twenty thousand, six".