2021457289 has 4 divisors (see below), whose sum is σ = 2021669956. Its totient is φ = 2021244624.

The previous prime is 2021457257. The next prime is 2021457299. The reversal of 2021457289 is 9827541202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190302025 + 1831155264 = 13795^2 + 42792^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021457289 - 2⁵ = 2021457257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021457299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91374 + ... + 111319.

It is an arithmetic number, because the mean of its divisors is an integer number (505417489).

Almost surely, 2^2021457289 is an apocalyptic number.

It is an amenable number.

2021457289 is a deficient number, since it is larger than the sum of its proper divisors (212667).

2021457289 is an equidigital number, since it uses as much as digits as its factorization.

2021457289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212666.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 2021457289 is about 44960.6193129054. The cubic root of 2021457289 is about 1264.4107800791.

The spelling of 2021457289 in words is "two billion, twenty-one million, four hundred fifty-seven thousand, two hundred eighty-nine".