1221030945109 has 2 divisors, whose sum is σ = 1221030945110. Its totient is φ = 1221030945108.

The previous prime is 1221030945091. The next prime is 1221030945131. The reversal of 1221030945109 is 9015490301221.

Together with previous prime (1221030945091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1128912625009 + 92118320100 = 1062503^2 + 303510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221030945109 - 2¹⁵ = 1221030912341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221036945109) 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, 610515472554 + 610515472555.

It is an arithmetic number, because the mean of its divisors is an integer number (610515472555).

Almost surely, 2^{1221030945109} is an apocalyptic number.

It is an amenable number.

1221030945109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221030945109 is an equidigital number, since it uses as much as digits as its factorization.

1221030945109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 1221030945109 in words is "one trillion, two hundred twenty-one billion, thirty million, nine hundred forty-five thousand, one hundred nine".