21110120111 has 8 divisors (see below), whose sum is σ = 21181913760. Its totient is φ = 21038439168.

The previous prime is 21110120093. The next prime is 21110120113. The reversal of 21110120111 is 11102101112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21110120111 - 2⁶ = 21110120047 is a prime.

It is a super-2 number, since 2×21110120111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110120092 and 21110120101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110120113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355895 + ... + 410951.

It is an arithmetic number, because the mean of its divisors is an integer number (2647739220).

Almost surely, 2^21110120111 is an apocalyptic number.

21110120111 is a deficient number, since it is larger than the sum of its proper divisors (71793649).

21110120111 is an equidigital number, since it uses as much as digits as its factorization.

21110120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56353.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21110120111 its reverse (11102101112), we get a palindrome (32212221223).

The spelling of 21110120111 in words is "twenty-one billion, one hundred ten million, one hundred twenty thousand, one hundred eleven".