18112021210111 has 4 divisors (see below), whose sum is σ = 18112101751800. Its totient is φ = 18111940668424.

The previous prime is 18112021210067. The next prime is 18112021210139. The reversal of 18112021210111 is 11101212021181.

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 18112021210111 - 2¹⁵ = 18112021177343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18112021210211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39932581 + ... + 40383598.

It is an arithmetic number, because the mean of its divisors is an integer number (4528025437950).

Almost surely, 2^{18112021210111} is an apocalyptic number.

18112021210111 is a deficient number, since it is larger than the sum of its proper divisors (80541689).

18112021210111 is an equidigital number, since it uses as much as digits as its factorization.

18112021210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80541688.

The product of its (nonzero) digits is 64, while the sum is 22.

Adding to 18112021210111 its reverse (11101212021181), we get a palindrome (29213233231292).

The spelling of 18112021210111 in words is "eighteen trillion, one hundred twelve billion, twenty-one million, two hundred ten thousand, one hundred eleven".