2108675721 has 8 divisors (see below), whose sum is σ = 2827820160. Its totient is φ = 1397657552.

The previous prime is 2108675693. The next prime is 2108675747. The reversal of 2108675721 is 1275768012.

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 2108675721 - 2⁷ = 2108675593 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2108675721.

It is not an unprimeable number, because it can be changed into a prime (2108675771) 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, 2030961 + ... + 2031998.

It is an arithmetic number, because the mean of its divisors is an integer number (353477520).

Almost surely, 2^2108675721 is an apocalyptic number.

It is an amenable number.

2108675721 is a deficient number, since it is larger than the sum of its proper divisors (719144439).

2108675721 is a wasteful number, since it uses less digits than its factorization.

2108675721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063135.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 2108675721 is about 45920.3192606497. The cubic root of 2108675721 is about 1282.3402257937.

The spelling of 2108675721 in words is "two billion, one hundred eight million, six hundred seventy-five thousand, seven hundred twenty-one".