21112001110221 has 32 divisors (see below), whose sum is σ = 32252662016256. Its totient is φ = 12033256320000.

The previous prime is 21112001110139. The next prime is 21112001110247. The reversal of 21112001110221 is 12201110021112.

It is a happy number.

It is not a de Polignac number, because 21112001110221 - 2¹⁰ = 21112001109197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112001110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112001114221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182349411 + ... + 182465151.

It is an arithmetic number, because the mean of its divisors is an integer number (1007895688008).

Almost surely, 2^{21112001110221} is an apocalyptic number.

21112001110221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21112001110221 is a deficient number, since it is larger than the sum of its proper divisors (11140660906035).

21112001110221 is a wasteful number, since it uses less digits than its factorization.

21112001110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137813.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21112001110221 its reverse (12201110021112), we get a palindrome (33313111131333).

The spelling of 21112001110221 in words is "twenty-one trillion, one hundred twelve billion, one million, one hundred ten thousand, two hundred twenty-one".