12210111221 has 32 divisors (see below), whose sum is σ = 15653088000. Its totient is φ = 9248878080.

The previous prime is 12210111203. The next prime is 12210111281. The reversal of 12210111221 is 12211101221.

It is a cyclic number.

It is not a de Polignac number, because 12210111221 - 2⁶ = 12210111157 is a prime.

It is a super-2 number, since 2×12210111221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12210111196 and 12210111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210111281) 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, 431105 + ... + 458553.

It is an arithmetic number, because the mean of its divisors is an integer number (489159000).

Almost surely, 2^12210111221 is an apocalyptic number.

12210111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12210111221 is a deficient number, since it is larger than the sum of its proper divisors (3442976779).

12210111221 is a wasteful number, since it uses less digits than its factorization.

12210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27629.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12210111221 its reverse (12211101221), we get a palindrome (24421212442).

The spelling of 12210111221 in words is "twelve billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".