2081721853 has 8 divisors (see below), whose sum is σ = 2088011520. Its totient is φ = 2075442960.

The previous prime is 2081721799. The next prime is 2081721857. The reversal of 2081721853 is 3581271802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2081721853 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 (2081721857) 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, 529228 + ... + 533146.

It is an arithmetic number, because the mean of its divisors is an integer number (261001440).

Almost surely, 2^2081721853 is an apocalyptic number.

It is an amenable number.

2081721853 is a deficient number, since it is larger than the sum of its proper divisors (6289667).

2081721853 is an equidigital number, since it uses as much as digits as its factorization.

2081721853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 2081721853 is about 45625.8901611793. The cubic root of 2081721853 is about 1276.8529976913.

The spelling of 2081721853 in words is "two billion, eighty-one million, seven hundred twenty-one thousand, eight hundred fifty-three".