1273484669921 has 2 divisors, whose sum is σ = 1273484669922. Its totient is φ = 1273484669920.

The previous prime is 1273484669903. The next prime is 1273484669969. The reversal of 1273484669921 is 1299664843721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1115482394896 + 158002275025 = 1056164^2 + 397495^2 .

It is an emirp because it is prime and its reverse (1299664843721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1273484669921 - 2¹⁸ = 1273484407777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1273484669981) 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, 636742334960 + 636742334961.

It is an arithmetic number, because the mean of its divisors is an integer number (636742334961).

Almost surely, 2^{1273484669921} is an apocalyptic number.

It is an amenable number.

1273484669921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273484669921 is an equidigital number, since it uses as much as digits as its factorization.

1273484669921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 62.

The spelling of 1273484669921 in words is "one trillion, two hundred seventy-three billion, four hundred eighty-four million, six hundred sixty-nine thousand, nine hundred twenty-one".