21110122111 has 8 divisors (see below), whose sum is σ = 23467332224. Its totient is φ = 18857676960.

The previous prime is 21110122109. The next prime is 21110122133. The reversal of 21110122111 is 11122101112.

It is a happy number.

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

It is not a de Polignac number, because 21110122111 - 2¹ = 21110122109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110122091 and 21110122100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110122141) 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, 26190816 + ... + 26191621.

It is an arithmetic number, because the mean of its divisors is an integer number (2933416528).

Almost surely, 2^21110122111 is an apocalyptic number.

21110122111 is a deficient number, since it is larger than the sum of its proper divisors (2357210113).

21110122111 is a wasteful number, since it uses less digits than its factorization.

21110122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52382481.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110122111 its reverse (11122101112), we get a palindrome (32232223223).

The spelling of 21110122111 in words is "twenty-one billion, one hundred ten million, one hundred twenty-two thousand, one hundred eleven".