2081398021009 has 4 divisors (see below), whose sum is σ = 2081700424816. Its totient is φ = 2081095617204.

The previous prime is 2081398021007. The next prime is 2081398021033. The reversal of 2081398021009 is 9001208931802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2081398021009 - 2¹ = 2081398021007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081398021007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151191579 + ... + 151205344.

It is an arithmetic number, because the mean of its divisors is an integer number (520425106204).

Almost surely, 2^{2081398021009} is an apocalyptic number.

It is an amenable number.

2081398021009 is a deficient number, since it is larger than the sum of its proper divisors (302403807).

2081398021009 is an equidigital number, since it uses as much as digits as its factorization.

2081398021009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302403806.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 2081398021009 in words is "two trillion, eighty-one billion, three hundred ninety-eight million, twenty-one thousand, nine".