21112120211 has 8 divisors (see below), whose sum is σ = 25984148064. Its totient is φ = 16704095040.

The previous prime is 21112120181. The next prime is 21112120219. The reversal of 21112120211 is 11202121112.

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

It is a cyclic number.

It is not a de Polignac number, because 21112120211 - 2¹⁰ = 21112119187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112120219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116000570 + ... + 116000751.

It is an arithmetic number, because the mean of its divisors is an integer number (3248018508).

Almost surely, 2^21112120211 is an apocalyptic number.

21112120211 is a deficient number, since it is larger than the sum of its proper divisors (4872027853).

21112120211 is a wasteful number, since it uses less digits than its factorization.

21112120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232001341.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21112120211 its reverse (11202121112), we get a palindrome (32314241323).

Subtracting from 21112120211 its reverse (11202121112), we obtain a palindrome (9909999099).

The spelling of 21112120211 in words is "twenty-one billion, one hundred twelve million, one hundred twenty thousand, two hundred eleven".