12210111111221 has 4 divisors (see below), whose sum is σ = 12211137441612. Its totient is φ = 12209084780832.

The previous prime is 12210111111203. The next prime is 12210111111269. The reversal of 12210111111221 is 12211111101221.

12210111111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8633965366321 + 3576145744900 = 2938361^2 + 1891070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12210111111221 is a prime.

It is a super-2 number, since 2×12210111111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12210111111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210411111221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513147350 + ... + 513171143.

It is an arithmetic number, because the mean of its divisors is an integer number (3052784360403).

Almost surely, 2^{12210111111221} is an apocalyptic number.

It is an amenable number.

12210111111221 is a deficient number, since it is larger than the sum of its proper divisors (1026330391).

12210111111221 is a wasteful number, since it uses less digits than its factorization.

12210111111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026330390.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12210111111221 its reverse (12211111101221), we get a palindrome (24421222212442).

The spelling of 12210111111221 in words is "twelve trillion, two hundred ten billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".