107705921 has 4 divisors (see below), whose sum is σ = 108073812. Its totient is φ = 107338032.

The previous prime is 107705903. The next prime is 107705947. The reversal of 107705921 is 129507701.

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 105349696 + 2356225 = 10264^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 107705921 - 2¹⁴ = 107689537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (107705951) 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, 183506 + ... + 184091.

It is an arithmetic number, because the mean of its divisors is an integer number (27018453).

Almost surely, 2^107705921 is an apocalyptic number.

It is an amenable number.

107705921 is a deficient number, since it is larger than the sum of its proper divisors (367891).

107705921 is an equidigital number, since it uses as much as digits as its factorization.

107705921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367890.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 107705921 is about 10378.1463181052. The cubic root of 107705921 is about 475.7876807136.

The spelling of 107705921 in words is "one hundred seven million, seven hundred five thousand, nine hundred twenty-one".