21120113123211 has 16 divisors (see below), whose sum is σ = 29816723026944. Its totient is φ = 13251794469504.

The previous prime is 21120113123129. The next prime is 21120113123233. The reversal of 21120113123211 is 11232131102112.

It is a de Polignac number, because none of the positive numbers 2^k-21120113123211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120113123311) 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, 31250110 + ... + 31918796.

It is an arithmetic number, because the mean of its divisors is an integer number (1863545189184).

Almost surely, 2^{21120113123211} is an apocalyptic number.

21120113123211 is a deficient number, since it is larger than the sum of its proper divisors (8696609903733).

21120113123211 is a wasteful number, since it uses less digits than its factorization.

21120113123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288010.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21120113123211 its reverse (11232131102112), we get a palindrome (32352244225323).

The spelling of 21120113123211 in words is "twenty-one trillion, one hundred twenty billion, one hundred thirteen million, one hundred twenty-three thousand, two hundred eleven".