103707721 has 4 divisors (see below), whose sum is σ = 111685252. Its totient is φ = 95730192.

The previous prime is 103707691. The next prime is 103707727. The reversal of 103707721 is 127707301.

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 21261321 + 82446400 = 4611^2 + 9080^2 .

It is a cyclic number.

It is not a de Polignac number, because 103707721 - 2⁵ = 103707689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 103707721.

It is not an unprimeable number, because it can be changed into a prime (103707727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3988746 + ... + 3988771.

It is an arithmetic number, because the mean of its divisors is an integer number (27921313).

Almost surely, 2^103707721 is an apocalyptic number.

It is an amenable number.

103707721 is a deficient number, since it is larger than the sum of its proper divisors (7977531).

103707721 is an equidigital number, since it uses as much as digits as its factorization.

103707721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977530.

The product of its (nonzero) digits is 2058, while the sum is 28.

The square root of 103707721 is about 10183.6987877686. The cubic root of 103707721 is about 469.8259820542.

The spelling of 103707721 in words is "one hundred three million, seven hundred seven thousand, seven hundred twenty-one".