1221310212103 has 2 divisors, whose sum is σ = 1221310212104. Its totient is φ = 1221310212102.

The previous prime is 1221310212041. The next prime is 1221310212193. The reversal of 1221310212103 is 3012120131221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221310212103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221310212193) 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, 610655106051 + 610655106052.

It is an arithmetic number, because the mean of its divisors is an integer number (610655106052).

Almost surely, 2^{1221310212103} is an apocalyptic number.

1221310212103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221310212103 is an equidigital number, since it uses as much as digits as its factorization.

1221310212103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1221310212103 its reverse (3012120131221), we get a palindrome (4233430343324).

The spelling of 1221310212103 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, two hundred twelve thousand, one hundred three".