12210020221 has 4 divisors (see below), whose sum is σ = 13954308832. Its totient is φ = 10465731612.

The previous prime is 12210020219. The next prime is 12210020227. The reversal of 12210020221 is 12202001221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12210020221 - 2¹ = 12210020219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210020227) 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, 872144295 + ... + 872144308.

It is an arithmetic number, because the mean of its divisors is an integer number (3488577208).

Almost surely, 2^12210020221 is an apocalyptic number.

It is an amenable number.

12210020221 is a deficient number, since it is larger than the sum of its proper divisors (1744288611).

12210020221 is an equidigital number, since it uses as much as digits as its factorization.

12210020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744288610.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12210020221 its reverse (12202001221), we get a palindrome (24412021442).

The spelling of 12210020221 in words is "twelve billion, two hundred ten million, twenty thousand, two hundred twenty-one".