18112022111 has 4 divisors (see below), whose sum is σ = 18127490424. Its totient is φ = 18096553800.

The previous prime is 18112022057. The next prime is 18112022119. The reversal of 18112022111 is 11122021181.

It is a happy number.

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 18112022111 - 2¹⁴ = 18112005727 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 (18112022119) 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, 7732400 + ... + 7734741.

It is an arithmetic number, because the mean of its divisors is an integer number (4531872606).

Almost surely, 2^18112022111 is an apocalyptic number.

18112022111 is a deficient number, since it is larger than the sum of its proper divisors (15468313).

18112022111 is a wasteful number, since it uses less digits than its factorization.

18112022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15468312.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 18112022111 its reverse (11122021181), we get a palindrome (29234043292).

The spelling of 18112022111 in words is "eighteen billion, one hundred twelve million, twenty-two thousand, one hundred eleven".