990121300999973 has 2 divisors, whose sum is σ = 990121300999974. Its totient is φ = 990121300999972.

The previous prime is 990121300999967. The next prime is 990121301000009. The reversal of 990121300999973 is 379999003121099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 973146554918209 + 16974746081764 = 31195297^2 + 4120042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990121300999973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 990121300999897 and 990121300999906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990121300999933) 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, 495060650499986 + 495060650499987.

It is an arithmetic number, because the mean of its divisors is an integer number (495060650499987).

Almost surely, 2^{990121300999973} is an apocalyptic number.

It is an amenable number.

990121300999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

990121300999973 is an equidigital number, since it uses as much as digits as its factorization.

990121300999973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66961566, while the sum is 71.

The spelling of 990121300999973 in words is "nine hundred ninety trillion, one hundred twenty-one billion, three hundred million, nine hundred ninety-nine thousand, nine hundred seventy-three".