18101220011 has 16 divisors (see below), whose sum is σ = 21197550528. Its totient is φ = 15132710400.

The previous prime is 18101219989. The next prime is 18101220037. The reversal of 18101220011 is 11002210181.

It is a cyclic number.

It is not a de Polignac number, because 18101220011 - 2³⁰ = 17027478187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18101220061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452041 + ... + 1464453.

It is an arithmetic number, because the mean of its divisors is an integer number (1324846908).

Almost surely, 2^18101220011 is an apocalyptic number.

18101220011 is a deficient number, since it is larger than the sum of its proper divisors (3096330517).

18101220011 is a wasteful number, since it uses less digits than its factorization.

18101220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17542.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 18101220011 its reverse (11002210181), we get a palindrome (29103430192).

The spelling of 18101220011 in words is "eighteen billion, one hundred one million, two hundred twenty thousand, eleven".