1221011010269 has 2 divisors, whose sum is σ = 1221011010270. Its totient is φ = 1221011010268.

The previous prime is 1221011010187. The next prime is 1221011010287. The reversal of 1221011010269 is 9620101101221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 774025165369 + 446985844900 = 879787^2 + 668570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221011010269 - 2³² = 1216716042973 is a prime.

It is a super-2 number, since 2×1221011010269² (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 (1221011010169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505505134 + 610505505135.

It is an arithmetic number, because the mean of its divisors is an integer number (610505505135).

Almost surely, 2^{1221011010269} is an apocalyptic number.

It is an amenable number.

1221011010269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011010269 is an equidigital number, since it uses as much as digits as its factorization.

1221011010269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 1221011010269 in words is "one trillion, two hundred twenty-one billion, eleven million, ten thousand, two hundred sixty-nine".