21111120112209 has 4 divisors (see below), whose sum is σ = 28148160149616. Its totient is φ = 14074080074804.

The previous prime is 21111120112177. The next prime is 21111120112219. The reversal of 21111120112209 is 90221102111112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21111120112209 - 2⁵ = 21111120112177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111120112219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518520018699 + ... + 3518520018704.

It is an arithmetic number, because the mean of its divisors is an integer number (7037040037404).

Almost surely, 2^{21111120112209} is an apocalyptic number.

It is an amenable number.

21111120112209 is a deficient number, since it is larger than the sum of its proper divisors (7037040037407).

21111120112209 is an equidigital number, since it uses as much as digits as its factorization.

21111120112209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037040037406.

The product of its (nonzero) digits is 144, while the sum is 24.

The spelling of 21111120112209 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty million, one hundred twelve thousand, two hundred nine".