12212421221 has 48 divisors (see below), whose sum is σ = 16561372800. Its totient is φ = 8762878080.

The previous prime is 12212421187. The next prime is 12212421229.

It is a happy number.

12212421221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12212421221 - 2¹⁰ = 12212420197 is a prime.

It is a super-2 number, since 2×12212421221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12212421193 and 12212421202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212421229) 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 47 ways as a sum of consecutive naturals, for example, 5603510 + ... + 5605688.

It is an arithmetic number, because the mean of its divisors is an integer number (345028600).

Almost surely, 2^12212421221 is an apocalyptic number.

12212421221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212421221 is a deficient number, since it is larger than the sum of its proper divisors (4348951579).

12212421221 is a wasteful number, since it uses less digits than its factorization.

12212421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730 (or 2719 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

The spelling of 12212421221 in words is "twelve billion, two hundred twelve million, four hundred twenty-one thousand, two hundred twenty-one".