130423721 has 4 divisors (see below), whose sum is σ = 130484112. Its totient is φ = 130363332.

The previous prime is 130423717. The next prime is 130423729. The reversal of 130423721 is 127324031.

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: 127324031 = 9349 ⋅13619.

It is a cyclic number.

It is not a de Polignac number, because 130423721 - 2² = 130423717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (130423729) 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, 26831 + ... + 31316.

It is an arithmetic number, because the mean of its divisors is an integer number (32621028).

Almost surely, 2^130423721 is an apocalyptic number.

It is an amenable number.

130423721 is a deficient number, since it is larger than the sum of its proper divisors (60391).

130423721 is an equidigital number, since it uses as much as digits as its factorization.

130423721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60390.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 130423721 is about 11420.3205296524. The cubic root of 130423721 is about 507.1294856829.

Adding to 130423721 its reverse (127324031), we get a palindrome (257747752).

The spelling of 130423721 in words is "one hundred thirty million, four hundred twenty-three thousand, seven hundred twenty-one".