2021544389 has 2 divisors, whose sum is σ = 2021544390. Its totient is φ = 2021544388.

The previous prime is 2021544377. The next prime is 2021544457. The reversal of 2021544389 is 9834451202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1752092164 + 269452225 = 41858^2 + 16415^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021544389 - 2¹² = 2021540293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021546389) 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, 1010772194 + 1010772195.

It is an arithmetic number, because the mean of its divisors is an integer number (1010772195).

Almost surely, 2^2021544389 is an apocalyptic number.

It is an amenable number.

2021544389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021544389 is an equidigital number, since it uses as much as digits as its factorization.

2021544389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 2021544389 is about 44961.5879279191. The cubic root of 2021544389 is about 1264.4289400138.

The spelling of 2021544389 in words is "two billion, twenty-one million, five hundred forty-four thousand, three hundred eighty-nine".