130721104 has 20 divisors (see below), whose sum is σ = 253567476. Its totient is φ = 65284352.

The previous prime is 130721093. The next prime is 130721117. The reversal of 130721104 is 401127031.

It can be written as a sum of positive squares in 2 ways, for example, as 48274704 + 82446400 = 6948^2 + 9080^2 .

It is a congruent number.

It is an unprimeable number.

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, 10962 + ... + 19534.

Almost surely, 2^130721104 is an apocalyptic number.

It is an amenable number.

130721104 is a deficient number, since it is larger than the sum of its proper divisors (122846372).

130721104 is an equidigital number, since it uses as much as digits as its factorization.

130721104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9534 (or 9528 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 130721104 is about 11433.3330223518. Note that the first 3 decimals coincide. The cubic root of 130721104 is about 507.5146334363.

Adding to 130721104 its reverse (401127031), we get a palindrome (531848135).

The spelling of 130721104 in words is "one hundred thirty million, seven hundred twenty-one thousand, one hundred four".