1203100211221 has 4 divisors (see below), whose sum is σ = 1203148926700. Its totient is φ = 1203051495744.

The previous prime is 1203100211207. The next prime is 1203100211227. The reversal of 1203100211221 is 1221120013021.

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 430485580996 + 772614630225 = 656114^2 + 878985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1203100211221 - 2¹¹ = 1203100209173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1203100211195 and 1203100211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203100211227) 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, 24320676 + ... + 24370093.

It is an arithmetic number, because the mean of its divisors is an integer number (300787231675).

Almost surely, 2^{1203100211221} is an apocalyptic number.

It is an amenable number.

1203100211221 is a deficient number, since it is larger than the sum of its proper divisors (48715479).

1203100211221 is an equidigital number, since it uses as much as digits as its factorization.

1203100211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48715478.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1203100211221 its reverse (1221120013021), we get a palindrome (2424220224242).

The spelling of 1203100211221 in words is "one trillion, two hundred three billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".