2021121121973 has 2 divisors, whose sum is σ = 2021121121974. Its totient is φ = 2021121121972.

The previous prime is 2021121121949. The next prime is 2021121122021. The reversal of 2021121121973 is 3791211211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1198287083569 + 822834038404 = 1094663^2 + 907102^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021121121973 - 2²⁶ = 2021054013109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021121121913) 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, 1010560560986 + 1010560560987.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560560987).

Almost surely, 2^{2021121121973} is an apocalyptic number.

It is an amenable number.

2021121121973 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021121121973 is an equidigital number, since it uses as much as digits as its factorization.

2021121121973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 2021121121973 in words is "two trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, nine hundred seventy-three".