12212021221 has 16 divisors (see below), whose sum is σ = 12964976640. Its totient is φ = 11470518000.

The previous prime is 12212021219. The next prime is 12212021279.

It is a happy number.

12212021221 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12212021221 - 2¹ = 12212021219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212021195 and 12212021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212021291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1057746 + ... + 1069228.

It is an arithmetic number, because the mean of its divisors is an integer number (810311040).

Almost surely, 2^12212021221 is an apocalyptic number.

It is an amenable number.

12212021221 is a deficient number, since it is larger than the sum of its proper divisors (752955419).

12212021221 is a wasteful number, since it uses less digits than its factorization.

12212021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11976.

The product of its (nonzero) digits is 64, while the sum is 16.

It can be divided in two parts, 122120 and 21221, that added together give a palindrome (143341).

The spelling of 12212021221 in words is "twelve billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".