130243921 has 4 divisors (see below), whose sum is σ = 133420644. Its totient is φ = 127067200.

The previous prime is 130243907. The next prime is 130243943. The reversal of 130243921 is 129342031.

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 72863296 + 57380625 = 8536^2 + 7575^2 .

It is not a de Polignac number, because 130243921 - 2¹¹ = 130241873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (130243951) 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, 1588300 + ... + 1588381.

It is an arithmetic number, because the mean of its divisors is an integer number (33355161).

Almost surely, 2^130243921 is an apocalyptic number.

It is an amenable number.

130243921 is a deficient number, since it is larger than the sum of its proper divisors (3176723).

130243921 is an equidigital number, since it uses as much as digits as its factorization.

130243921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176722.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 130243921 is about 11412.4458815803. The cubic root of 130243921 is about 506.8963383854.

Adding to 130243921 its reverse (129342031), we get a palindrome (259585952).

The spelling of 130243921 in words is "one hundred thirty million, two hundred forty-three thousand, nine hundred twenty-one".