2107728101 has 4 divisors (see below), whose sum is σ = 2108093100. Its totient is φ = 2107363104.

The previous prime is 2107728097. The next prime is 2107728107. The reversal of 2107728101 is 1018277012.

It is a Cunningham number, because it is equal to 45910²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202492900 + 1905235201 = 14230^2 + 43649^2 .

It is a cyclic number.

It is not a de Polignac number, because 2107728101 - 2² = 2107728097 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 (2107728107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173696 + ... + 185433.

It is an arithmetic number, because the mean of its divisors is an integer number (527023275).

Almost surely, 2^2107728101 is an apocalyptic number.

It is an amenable number.

2107728101 is a deficient number, since it is larger than the sum of its proper divisors (364999).

2107728101 is an equidigital number, since it uses as much as digits as its factorization.

2107728101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364998.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 2107728101 is about 45910.0000108909. Note that the first 4 decimals coincide. The cubic root of 2107728101 is about 1282.1481062710.

The spelling of 2107728101 in words is "two billion, one hundred seven million, seven hundred twenty-eight thousand, one hundred one".