2021163847909 has 8 divisors (see below), whose sum is σ = 2023910209728. Its totient is φ = 2018417724960.

The previous prime is 2021163847849. The next prime is 2021163847957. The reversal of 2021163847909 is 9097483611202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2021163847909 - 2³⁷ = 1883724894437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021163817909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22730074 + ... + 22818820.

It is an arithmetic number, because the mean of its divisors is an integer number (252988776216).

Almost surely, 2^{2021163847909} is an apocalyptic number.

It is an amenable number.

2021163847909 is a deficient number, since it is larger than the sum of its proper divisors (2746361819).

2021163847909 is an equidigital number, since it uses as much as digits as its factorization.

2021163847909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119435.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 2021163847909 in words is "two trillion, twenty-one billion, one hundred sixty-three million, eight hundred forty-seven thousand, nine hundred nine".