2021171449 has 16 divisors (see below), whose sum is σ = 2296226304. Its totient is φ = 1762387200.

The previous prime is 2021171447. The next prime is 2021171459. The reversal of 2021171449 is 9441711202.

It is not a de Polignac number, because 2021171449 - 2¹ = 2021171447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021171449.

It is not an unprimeable number, because it can be changed into a prime (2021171447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12307 + ... + 64759.

It is an arithmetic number, because the mean of its divisors is an integer number (143514144).

Almost surely, 2^2021171449 is an apocalyptic number.

It is an amenable number.

2021171449 is a deficient number, since it is larger than the sum of its proper divisors (275054855).

2021171449 is a wasteful number, since it uses less digits than its factorization.

2021171449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52608.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2021171449 is about 44957.4404186893. The cubic root of 2021171449 is about 1264.3511801367.

The spelling of 2021171449 in words is "two billion, twenty-one million, one hundred seventy-one thousand, four hundred forty-nine".