1321211213269 has 2 divisors, whose sum is σ = 1321211213270. Its totient is φ = 1321211213268.

The previous prime is 1321211213251. The next prime is 1321211213321. The reversal of 1321211213269 is 9623121121231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817870627044 + 503340586225 = 904362^2 + 709465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321211213269 - 2²³ = 1321202824661 is a prime.

It is a super-2 number, since 2×1321211213269² (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 (1321211283269) 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, 660605606634 + 660605606635.

It is an arithmetic number, because the mean of its divisors is an integer number (660605606635).

Almost surely, 2^{1321211213269} is an apocalyptic number.

It is an amenable number.

1321211213269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321211213269 is an equidigital number, since it uses as much as digits as its factorization.

1321211213269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The spelling of 1321211213269 in words is "one trillion, three hundred twenty-one billion, two hundred eleven million, two hundred thirteen thousand, two hundred sixty-nine".