21120211105 has 16 divisors (see below), whose sum is σ = 28971020160. Its totient is φ = 14479350912.

The previous prime is 21120211093. The next prime is 21120211181. The reversal of 21120211105 is 50111202112.

It is a cyclic number.

It is not a de Polignac number, because 21120211105 - 2²³ = 21111822497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109402 + ... + 232828.

It is an arithmetic number, because the mean of its divisors is an integer number (1810688760).

Almost surely, 2^21120211105 is an apocalyptic number.

It is an amenable number.

21120211105 is a deficient number, since it is larger than the sum of its proper divisors (7850809055).

21120211105 is a wasteful number, since it uses less digits than its factorization.

21120211105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128328.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21120211105 its reverse (50111202112), we get a palindrome (71231413217).

The spelling of 21120211105 in words is "twenty-one billion, one hundred twenty million, two hundred eleven thousand, one hundred five".