12001020221 has 4 divisors (see below), whose sum is σ = 12001308000. Its totient is φ = 12000732444.

The previous prime is 12001020191. The next prime is 12001020259. The reversal of 12001020221 is 12202010021.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001020221 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 (12001050221) 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, 67991 + ... + 169188.

It is an arithmetic number, because the mean of its divisors is an integer number (3000327000).

Almost surely, 2^12001020221 is an apocalyptic number.

It is an amenable number.

12001020221 is a deficient number, since it is larger than the sum of its proper divisors (287779).

12001020221 is an equidigital number, since it uses as much as digits as its factorization.

12001020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287778.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12001020221 its reverse (12202010021), we get a palindrome (24203030242).

The spelling of 12001020221 in words is "twelve billion, one million, twenty thousand, two hundred twenty-one".