1020121969289 has 2 divisors, whose sum is σ = 1020121969290. Its totient is φ = 1020121969288.

The previous prime is 1020121969157. The next prime is 1020121969291. The reversal of 1020121969289 is 9829691210201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1019221489225 + 900480064 = 1009565^2 + 30008^2 .

It is an emirp because it is prime and its reverse (9829691210201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020121969289 is a prime.

Together with 1020121969291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1020121939289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060984644 + 510060984645.

It is an arithmetic number, because the mean of its divisors is an integer number (510060984645).

Almost surely, 2^{1020121969289} is an apocalyptic number.

It is an amenable number.

1020121969289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020121969289 is an equidigital number, since it uses as much as digits as its factorization.

1020121969289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 50.

The spelling of 1020121969289 in words is "one trillion, twenty billion, one hundred twenty-one million, nine hundred sixty-nine thousand, two hundred eighty-nine".