21110112212116 has 6 divisors (see below), whose sum is σ = 36942696371210. Its totient is φ = 10555056106056.

The previous prime is 21110112212113. The next prime is 21110112212117. The reversal of 21110112212116 is 61121221101112.

It can be written as a sum of positive squares in only one way, i.e., 16253395402500 + 4856716809616 = 4031550^2 + 2203796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110112212113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638764026511 + ... + 2638764026518.

Almost surely, 2^{21110112212116} is an apocalyptic number.

It is an amenable number.

21110112212116 is a deficient number, since it is larger than the sum of its proper divisors (15832584159094).

21110112212116 is a wasteful number, since it uses less digits than its factorization.

21110112212116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277528053033 (or 5277528053031 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 22.

Adding to 21110112212116 its reverse (61121221101112), we get a palindrome (82231333313228).

The spelling of 21110112212116 in words is "twenty-one trillion, one hundred ten billion, one hundred twelve million, two hundred twelve thousand, one hundred sixteen".