12000000221 has 16 divisors (see below), whose sum is σ = 13785638400. Its totient is φ = 10330628400.

The previous prime is 12000000169. The next prime is 12000000293. The reversal of 12000000221 is 12200000021.

It is a cyclic number.

It is not a de Polignac number, because 12000000221 - 2¹⁸ = 11999738077 is a prime.

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 = 12000000199 and 12000000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000000421) 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, 556010 + ... + 577188.

It is an arithmetic number, because the mean of its divisors is an integer number (861602400).

Almost surely, 2^12000000221 is an apocalyptic number.

12000000221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12000000221 is a deficient number, since it is larger than the sum of its proper divisors (1785638179).

12000000221 is a wasteful number, since it uses less digits than its factorization.

12000000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23920.

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

Adding to 12000000221 its reverse (12200000021), we get a palindrome (24200000242).

The spelling of 12000000221 in words is "twelve billion, two hundred twenty-one", and thus it is an aban number.