103138240721 has 4 divisors (see below), whose sum is σ = 108566569200. Its totient is φ = 97709912244.

The previous prime is 103138240717. The next prime is 103138240741. The reversal of 103138240721 is 127042831301.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127042831301 = 2393 ⋅53089357.

It is a cyclic number.

It is not a de Polignac number, because 103138240721 - 2² = 103138240717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103138240741) 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, 2714164211 + ... + 2714164248.

It is an arithmetic number, because the mean of its divisors is an integer number (27141642300).

Almost surely, 2^103138240721 is an apocalyptic number.

It is an amenable number.

103138240721 is a deficient number, since it is larger than the sum of its proper divisors (5428328479).

103138240721 is an equidigital number, since it uses as much as digits as its factorization.

103138240721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428328478.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 103138240721 in words is "one hundred three billion, one hundred thirty-eight million, two hundred forty thousand, seven hundred twenty-one".