12121220221001 has 4 divisors (see below), whose sum is σ = 12539193332100. Its totient is φ = 11703247109904.

The previous prime is 12121220220997. The next prime is 12121220221027. The reversal of 12121220221001 is 10012202212121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5377408517776 + 6743811703225 = 2318924^2 + 2596885^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121220221001 - 2² = 12121220220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121220221031) 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, 208986555506 + ... + 208986555563.

It is an arithmetic number, because the mean of its divisors is an integer number (3134798333025).

Almost surely, 2^{12121220221001} is an apocalyptic number.

It is an amenable number.

12121220221001 is a deficient number, since it is larger than the sum of its proper divisors (417973111099).

12121220221001 is an equidigital number, since it uses as much as digits as its factorization.

12121220221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417973111098.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12121220221001 its reverse (10012202212121), we get a palindrome (22133422433122).

The spelling of 12121220221001 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one".