1213100203111 has 2 divisors, whose sum is σ = 1213100203112. Its totient is φ = 1213100203110.

The previous prime is 1213100203103. The next prime is 1213100203141. The reversal of 1213100203111 is 1113020013121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213100203111 - 2³ = 1213100203103 is a prime.

It is a super-2 number, since 2×1213100203111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213100203141) 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 as a sum of consecutive naturals, namely, 606550101555 + 606550101556.

It is an arithmetic number, because the mean of its divisors is an integer number (606550101556).

Almost surely, 2^{1213100203111} is an apocalyptic number.

1213100203111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213100203111 is an equidigital number, since it uses as much as digits as its factorization.

1213100203111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1213100203111 its reverse (1113020013121), we get a palindrome (2326120216232).

The spelling of 1213100203111 in words is "one trillion, two hundred thirteen billion, one hundred million, two hundred three thousand, one hundred eleven".