12121100000221 has 4 divisors (see below), whose sum is σ = 12125125609344. Its totient is φ = 12117074391100.

The previous prime is 12121100000213. The next prime is 12121100000237. The reversal of 12121100000221 is 12200000112121.

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 not a de Polignac number, because 12121100000221 - 2³ = 12121100000213 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 (12121100060221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012800045 + ... + 2012806066.

It is an arithmetic number, because the mean of its divisors is an integer number (3031281402336).

Almost surely, 2^{12121100000221} is an apocalyptic number.

It is an amenable number.

12121100000221 is a deficient number, since it is larger than the sum of its proper divisors (4025609123).

12121100000221 is an equidigital number, since it uses as much as digits as its factorization.

12121100000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025609122.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12121100000221 its reverse (12200000112121), we get a palindrome (24321100112342).

The spelling of 12121100000221 in words is "twelve trillion, one hundred twenty-one billion, one hundred million, two hundred twenty-one", and thus it is an aban number.