1211212112203 has 2 divisors, whose sum is σ = 1211212112204. Its totient is φ = 1211212112202.

The previous prime is 1211212112197. The next prime is 1211212112293. The reversal of 1211212112203 is 3022112121121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211212112203 - 2⁹ = 1211212111691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211212112293) 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 as a sum of consecutive naturals, namely, 605606056101 + 605606056102.

It is an arithmetic number, because the mean of its divisors is an integer number (605606056102).

Almost surely, 2^{1211212112203} is an apocalyptic number.

1211212112203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211212112203 is an equidigital number, since it uses as much as digits as its factorization.

1211212112203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1211212112203 its reverse (3022112121121), we get a palindrome (4233324233324).

It can be divided in two parts, 12112121 and 12203, that added together give a square (12124324 = 3482²).

The spelling of 1211212112203 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twelve thousand, two hundred three".