1221033042209 has 2 divisors, whose sum is σ = 1221033042210. Its totient is φ = 1221033042208.

The previous prime is 1221033042143. The next prime is 1221033042253. The reversal of 1221033042209 is 9022403301221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1089042519184 + 131990523025 = 1043572^2 + 363305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221033042209 - 2⁸ = 1221033041953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221033042709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610516521104 + 610516521105.

It is an arithmetic number, because the mean of its divisors is an integer number (610516521105).

Almost surely, 2^{1221033042209} is an apocalyptic number.

It is an amenable number.

1221033042209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221033042209 is an equidigital number, since it uses as much as digits as its factorization.

1221033042209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 1221033042209 in words is "one trillion, two hundred twenty-one billion, thirty-three million, forty-two thousand, two hundred nine".