21110321123111 has 8 divisors (see below), whose sum is σ = 23070786727824. Its totient is φ = 19156746435520.

The previous prime is 21110321123093. The next prime is 21110321123153. The reversal of 21110321123111 is 11132112301112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110321123111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110321123191) 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, 1722722870 + ... + 1722735123.

It is an arithmetic number, because the mean of its divisors is an integer number (2883848340978).

Almost surely, 2^{21110321123111} is an apocalyptic number.

21110321123111 is a deficient number, since it is larger than the sum of its proper divisors (1960465604713).

21110321123111 is a wasteful number, since it uses less digits than its factorization.

21110321123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445458561.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 21110321123111 its reverse (11132112301112), we get a palindrome (32242433424223).

The spelling of 21110321123111 in words is "twenty-one trillion, one hundred ten billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred eleven".