12001000221 has 24 divisors (see below), whose sum is σ = 19814046720. Its totient is φ = 6856720416.

The previous prime is 12001000217. The next prime is 12001000223. The reversal of 12001000221 is 12200010021.

It is not a de Polignac number, because 12001000221 - 2² = 12001000217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001000223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841476 + ... + 855618.

It is an arithmetic number, because the mean of its divisors is an integer number (825585280).

Almost surely, 2^12001000221 is an apocalyptic number.

It is an amenable number.

12001000221 is a deficient number, since it is larger than the sum of its proper divisors (7813046499).

12001000221 is a wasteful number, since it uses less digits than its factorization.

12001000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27625 (or 27622 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12001000221 its reverse (12200010021), we get a palindrome (24201010242).

The spelling of 12001000221 in words is "twelve billion, one million, two hundred twenty-one", and thus it is an aban number.