1020121273 has 2 divisors, whose sum is σ = 1020121274. Its totient is φ = 1020121272.

The previous prime is 1020121243. The next prime is 1020121301. The reversal of 1020121273 is 3721210201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984265129 + 35856144 = 31373^2 + 5988^2 .

It is an emirp because it is prime and its reverse (3721210201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020121273 - 2⁵ = 1020121241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020121273.

It is not a weakly prime, because it can be changed into another prime (1020121213) 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, 510060636 + 510060637.

It is an arithmetic number, because the mean of its divisors is an integer number (510060637).

Almost surely, 2^1020121273 is an apocalyptic number.

It is an amenable number.

1020121273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020121273 is an equidigital number, since it uses as much as digits as its factorization.

1020121273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1020121273 is about 31939.3373913737. The cubic root of 1020121273 is about 1006.6626021477.

Adding to 1020121273 its reverse (3721210201), we get a palindrome (4741331474).

It can be divided in two parts, 102012 and 1273, that added together give a triangular number (103285 = T₄₅₄).

The spelling of 1020121273 in words is "one billion, twenty million, one hundred twenty-one thousand, two hundred seventy-three".