12210111101221 has 16 divisors (see below), whose sum is σ = 13563177322176. Its totient is φ = 10990198890000.

The previous prime is 12210111101147. The next prime is 12210111101267.

12210111101221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12210111101221 - 2¹⁹ = 12210110576933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12210111101195 and 12210111101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210111101281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45279615 + ... + 45548476.

It is an arithmetic number, because the mean of its divisors is an integer number (847698582636).

Almost surely, 2^{12210111101221} is an apocalyptic number.

12210111101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12210111101221 is a deficient number, since it is larger than the sum of its proper divisors (1353066220955).

12210111101221 is an equidigital number, since it uses as much as digits as its factorization.

12210111101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90828225 (or 90828203 counting only the distinct ones).

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

It can be divided in two parts, 1221011 and 1101221, that added together give a palindrome (2322232).

The spelling of 12210111101221 in words is "twelve trillion, two hundred ten billion, one hundred eleven million, one hundred one thousand, two hundred twenty-one".