1212200221201 has 4 divisors (see below), whose sum is σ = 1212899703732. Its totient is φ = 1211500738672.

The previous prime is 1212200221187. The next prime is 1212200221213. The reversal of 1212200221201 is 1021220022121.

It is a happy number.

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 463283061201 + 748917160000 = 680649^2 + 865400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212200221201 - 2¹⁹ = 1212199696913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212200221301) 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 3 ways as a sum of consecutive naturals, for example, 349738666 + ... + 349742131.

It is an arithmetic number, because the mean of its divisors is an integer number (303224925933).

Almost surely, 2^{1212200221201} is an apocalyptic number.

It is an amenable number.

1212200221201 is a deficient number, since it is larger than the sum of its proper divisors (699482531).

1212200221201 is an equidigital number, since it uses as much as digits as its factorization.

1212200221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699482530.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212200221201 its reverse (1021220022121), we get a palindrome (2233420243322).

It can be divided in two parts, 121220022120 and 1, that added together give a palindrome (121220022121).

The spelling of 1212200221201 in words is "one trillion, two hundred twelve billion, two hundred million, two hundred twenty-one thousand, two hundred one".