2021575729 has 2 divisors, whose sum is σ = 2021575730. Its totient is φ = 2021575728.

The previous prime is 2021575711. The next prime is 2021575733. The reversal of 2021575729 is 9275751202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1827391504 + 194184225 = 42748^2 + 13935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021575729 - 2⁷ = 2021575601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021575691 and 2021575700.

It is not a weakly prime, because it can be changed into another prime (2021575709) 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, 1010787864 + 1010787865.

It is an arithmetic number, because the mean of its divisors is an integer number (1010787865).

Almost surely, 2^2021575729 is an apocalyptic number.

It is an amenable number.

2021575729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021575729 is an equidigital number, since it uses as much as digits as its factorization.

2021575729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 2021575729 is about 44961.9364462875. The cubic root of 2021575729 is about 1264.4354741267.

The spelling of 2021575729 in words is "two billion, twenty-one million, five hundred seventy-five thousand, seven hundred twenty-nine".