107917921 has 4 divisors (see below), whose sum is σ = 114266052. Its totient is φ = 101569792.

The previous prime is 107917907. The next prime is 107917939. The reversal of 107917921 is 129719701.

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 81703521 + 26214400 = 9039^2 + 5120^2 .

It is a cyclic number.

It is not a de Polignac number, because 107917921 - 2²⁵ = 74363489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (107917991) 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, 3174040 + ... + 3174073.

It is an arithmetic number, because the mean of its divisors is an integer number (28566513).

Almost surely, 2^107917921 is an apocalyptic number.

It is an amenable number.

107917921 is a deficient number, since it is larger than the sum of its proper divisors (6348131).

107917921 is an equidigital number, since it uses as much as digits as its factorization.

107917921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6348130.

The product of its (nonzero) digits is 7938, while the sum is 37.

The square root of 107917921 is about 10388.3550670932. The cubic root of 107917921 is about 476.0996440054.

The spelling of 107917921 in words is "one hundred seven million, nine hundred seventeen thousand, nine hundred twenty-one".