1221002221169 has 2 divisors, whose sum is σ = 1221002221170. Its totient is φ = 1221002221168.

The previous prime is 1221002221097. The next prime is 1221002221223. The reversal of 1221002221169 is 9611222001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656983197025 + 564019024144 = 810545^2 + 751012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221002221169 is a prime.

It is a super-3 number, since 3×1221002221169³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1221002221069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501110584 + 610501110585.

It is an arithmetic number, because the mean of its divisors is an integer number (610501110585).

Almost surely, 2^{1221002221169} is an apocalyptic number.

It is an amenable number.

1221002221169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002221169 is an equidigital number, since it uses as much as digits as its factorization.

1221002221169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 1221002221169 in words is "one trillion, two hundred twenty-one billion, two million, two hundred twenty-one thousand, one hundred sixty-nine".