12021210221 has 16 divisors (see below), whose sum is σ = 12820213440. Its totient is φ = 11232625920.

The previous prime is 12021210203. The next prime is 12021210251. The reversal of 12021210221 is 12201212021.

It is a cyclic number.

It is not a de Polignac number, because 12021210221 - 2²² = 12017015917 is a prime.

It is a super-3 number, since 3×12021210221³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12021210196 and 12021210205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021210251) 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, 2099855 + ... + 2105571.

It is an arithmetic number, because the mean of its divisors is an integer number (801263340).

Almost surely, 2^12021210221 is an apocalyptic number.

It is an amenable number.

12021210221 is a deficient number, since it is larger than the sum of its proper divisors (799003219).

12021210221 is a wasteful number, since it uses less digits than its factorization.

12021210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12021210221 its reverse (12201212021), we get a palindrome (24222422242).

The spelling of 12021210221 in words is "twelve billion, twenty-one million, two hundred ten thousand, two hundred twenty-one".