1212200201221 has 4 divisors (see below), whose sum is σ = 1237991694912. Its totient is φ = 1186408707532.

The previous prime is 1212200201209. The next prime is 1212200201249. The reversal of 1212200201221 is 1221020022121.

It is a happy number.

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 1212200201221 - 2²³ = 1212191812613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212200201195 and 1212200201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212200201321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12895746775 + ... + 12895746868.

It is an arithmetic number, because the mean of its divisors is an integer number (309497923728).

Almost surely, 2^{1212200201221} is an apocalyptic number.

It is an amenable number.

1212200201221 is a deficient number, since it is larger than the sum of its proper divisors (25791493691).

1212200201221 is an equidigital number, since it uses as much as digits as its factorization.

1212200201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25791493690.

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

Adding to 1212200201221 its reverse (1221020022121), we get a palindrome (2433220223342).

The spelling of 1212200201221 in words is "one trillion, two hundred twelve billion, two hundred million, two hundred one thousand, two hundred twenty-one".