130340021 has 4 divisors (see below), whose sum is σ = 148960032. Its totient is φ = 111720012.

The previous prime is 130339999. The next prime is 130340039. The reversal of 130340021 is 120043031.

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: 120043031 = 541 ⋅221891.

It is a cyclic number.

It is not a de Polignac number, because 130340021 - 2¹⁸ = 130077877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 130339978 and 130340005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130348021) 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, 9309995 + ... + 9310008.

It is an arithmetic number, because the mean of its divisors is an integer number (37240008).

Almost surely, 2^130340021 is an apocalyptic number.

It is an amenable number.

130340021 is a deficient number, since it is larger than the sum of its proper divisors (18620011).

130340021 is an equidigital number, since it uses as much as digits as its factorization.

130340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18620010.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 130340021 is about 11416.6554209190. The cubic root of 130340021 is about 507.0209782708.

Adding to 130340021 its reverse (120043031), we get a palindrome (250383052).

The spelling of 130340021 in words is "one hundred thirty million, three hundred forty thousand, twenty-one".