18100021011011 has 4 divisors (see below), whose sum is σ = 18163978682712. Its totient is φ = 18036063339312.

The previous prime is 18100021010999. The next prime is 18100021011031. The reversal of 18100021011011 is 11011012000181.

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 18100021011011 - 2⁴² = 13701974499907 is a prime.

It is a super-2 number, since 2×18100021011011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18100021011031) 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, 31978835426 + ... + 31978835991.

It is an arithmetic number, because the mean of its divisors is an integer number (4540994670678).

Almost surely, 2^{18100021011011} is an apocalyptic number.

18100021011011 is a deficient number, since it is larger than the sum of its proper divisors (63957671701).

18100021011011 is an equidigital number, since it uses as much as digits as its factorization.

18100021011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63957671700.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 18100021011011 its reverse (11011012000181), we get a palindrome (29111033011192).

The spelling of 18100021011011 in words is "eighteen trillion, one hundred billion, twenty-one million, eleven thousand, eleven".