2021440344509 has 2 divisors, whose sum is σ = 2021440344510. Its totient is φ = 2021440344508.

The previous prime is 2021440344487. The next prime is 2021440344587. The reversal of 2021440344509 is 9054430441202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1815478675609 + 205961668900 = 1347397^2 + 453830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021440344509 - 2¹⁶ = 2021440278973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021440341509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010720172254 + 1010720172255.

It is an arithmetic number, because the mean of its divisors is an integer number (1010720172255).

Almost surely, 2^{2021440344509} is an apocalyptic number.

It is an amenable number.

2021440344509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021440344509 is an equidigital number, since it uses as much as digits as its factorization.

2021440344509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 2021440344509 in words is "two trillion, twenty-one billion, four hundred forty million, three hundred forty-four thousand, five hundred nine".