2108728221 has 8 divisors (see below), whose sum is σ = 2902335744. Its totient is φ = 1360469760.

The previous prime is 2108728217. The next prime is 2108728231. The reversal of 2108728221 is 1228278012.

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

It is not a de Polignac number, because 2108728221 - 2² = 2108728217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108728211) 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, 11337156 + ... + 11337341.

It is an arithmetic number, because the mean of its divisors is an integer number (362791968).

Almost surely, 2^2108728221 is an apocalyptic number.

It is an amenable number.

2108728221 is a deficient number, since it is larger than the sum of its proper divisors (793607523).

2108728221 is a wasteful number, since it uses less digits than its factorization.

2108728221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22674531.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 2108728221 is about 45920.8908994588. The cubic root of 2108728221 is about 1282.3508679079.

The spelling of 2108728221 in words is "two billion, one hundred eight million, seven hundred twenty-eight thousand, two hundred twenty-one".