21211222110111 has 96 divisors (see below), whose sum is σ = 34855556456448. Its totient is φ = 12783508892640.

The previous prime is 21211222110109. The next prime is 21211222110161. The reversal of 21211222110111 is 11101122211212.

It is a happy number.

21211222110111 is a `hidden beast` number, since 212 + 11 + 222 + 110 + 111 = 666.

It is not a de Polignac number, because 21211222110111 - 2¹ = 21211222110109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222110161) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 523623120 + ... + 523663626.

It is an arithmetic number, because the mean of its divisors is an integer number (363078713088).

Almost surely, 2^{21211222110111} is an apocalyptic number.

21211222110111 is a deficient number, since it is larger than the sum of its proper divisors (13644334346337).

21211222110111 is a wasteful number, since it uses less digits than its factorization.

21211222110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41623 (or 41611 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21211222110111 its reverse (11101122211212), we get a palindrome (32312344321323).

The spelling of 21211222110111 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred ten thousand, one hundred eleven".