1221130202309 has 2 divisors, whose sum is σ = 1221130202310. Its totient is φ = 1221130202308.

The previous prime is 1221130202287. The next prime is 1221130202321. The reversal of 1221130202309 is 9032020311221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770318671684 + 450811530625 = 877678^2 + 671425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221130202309 - 2⁸ = 1221130202053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221130202909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610565101154 + 610565101155.

It is an arithmetic number, because the mean of its divisors is an integer number (610565101155).

Almost surely, 2^{1221130202309} is an apocalyptic number.

It is an amenable number.

1221130202309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221130202309 is an equidigital number, since it uses as much as digits as its factorization.

1221130202309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 1221130202309 in words is "one trillion, two hundred twenty-one billion, one hundred thirty million, two hundred two thousand, three hundred nine".