12121211211201 has 8 divisors (see below), whose sum is σ = 17957349942560. Its totient is φ = 8080807474116.

The previous prime is 12121211211173. The next prime is 12121211211233. The reversal of 12121211211201 is 10211211212121.

It is a happy number.

12121211211201 is a `hidden beast` number, since 1 + 21 + 21 + 211 + 211 + 201 = 666.

It is not a de Polignac number, because 12121211211201 - 2¹⁹ = 12121210686913 is a prime.

It is a super-2 number, since 2×12121211211201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121211911201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224466874255 + ... + 224466874308.

It is an arithmetic number, because the mean of its divisors is an integer number (2244668742820).

Almost surely, 2^{12121211211201} is an apocalyptic number.

It is an amenable number.

12121211211201 is a deficient number, since it is larger than the sum of its proper divisors (5836138731359).

12121211211201 is an equidigital number, since it uses as much as digits as its factorization.

12121211211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448933748572 (or 448933748566 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121211211201 its reverse (10211211212121), we get a palindrome (22332422423322).

The spelling of 12121211211201 in words is "twelve trillion, one hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred one".