21010111201111 has 8 divisors (see below), whose sum is σ = 22246220823120. Its totient is φ = 19774026104448.

The previous prime is 21010111201103. The next prime is 21010111201117. The reversal of 21010111201111 is 11110211101012.

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

It is not a de Polignac number, because 21010111201111 - 2³ = 21010111201103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010111201091 and 21010111201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010111201117) 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, 4352856 + ... + 7808173.

It is an arithmetic number, because the mean of its divisors is an integer number (2780777602890).

Almost surely, 2^{21010111201111} is an apocalyptic number.

21010111201111 is a deficient number, since it is larger than the sum of its proper divisors (1236109622009).

21010111201111 is a wasteful number, since it uses less digits than its factorization.

21010111201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12262673.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21010111201111 its reverse (11110211101012), we get a palindrome (32120322302123).

The spelling of 21010111201111 in words is "twenty-one trillion, ten billion, one hundred eleven million, two hundred one thousand, one hundred eleven".