21101211110111 has 16 divisors (see below), whose sum is σ = 23510682224640. Its totient is φ = 18773651894880.

The previous prime is 21101211110081. The next prime is 21101211110117. The reversal of 21101211110111 is 11101111210112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101211110111 is a prime.

It is a super-2 number, since 2×21101211110111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101211110117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7517405 + ... + 9935481.

It is an arithmetic number, because the mean of its divisors is an integer number (1469417639040).

Almost surely, 2^{21101211110111} is an apocalyptic number.

21101211110111 is a deficient number, since it is larger than the sum of its proper divisors (2409471114529).

21101211110111 is a wasteful number, since it uses less digits than its factorization.

21101211110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435014.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 21101211110111 its reverse (11101111210112), we get a palindrome (32202322320223).

The spelling of 21101211110111 in words is "twenty-one trillion, one hundred one billion, two hundred eleven million, one hundred ten thousand, one hundred eleven".