1221002221069 has 2 divisors, whose sum is σ = 1221002221070. Its totient is φ = 1221002221068.

The previous prime is 1221002221063. The next prime is 1221002221097. The reversal of 1221002221069 is 9601222001221.

It is an a-pointer prime, because the next prime (1221002221097) can be obtained adding 1221002221069 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 898789322025 + 322212899044 = 948045^2 + 567638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221002221069 is a prime.

It is a super-2 number, since 2×1221002221069² (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 (1221002221063) 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, 610501110534 + 610501110535.

It is an arithmetic number, because the mean of its divisors is an integer number (610501110535).

Almost surely, 2^{1221002221069} is an apocalyptic number.

It is an amenable number.

1221002221069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002221069 is an equidigital number, since it uses as much as digits as its factorization.

1221002221069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 1221002221069 in words is "one trillion, two hundred twenty-one billion, two million, two hundred twenty-one thousand, sixty-nine".