15130321 has 4 divisors (see below), whose sum is σ = 15195492. Its totient is φ = 15065152.

The previous prime is 15130307. The next prime is 15130331. The reversal of 15130321 is 12303151.

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 8473921 + 6656400 = 2911^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 15130321 - 2⁹ = 15129809 is a prime.

It is a super-2 number, since 2×15130321² = 457853227126082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15130295 and 15130304.

It is not an unprimeable number, because it can be changed into a prime (15130331) 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, 32236 + ... + 32701.

It is an arithmetic number, because the mean of its divisors is an integer number (3798873).

Almost surely, 2^15130321 is an apocalyptic number.

It is an amenable number.

15130321 is a deficient number, since it is larger than the sum of its proper divisors (65171).

15130321 is an equidigital number, since it uses as much as digits as its factorization.

15130321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65170.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 15130321 is about 3889.7713300399. The cubic root of 15130321 is about 247.3333694579. Note that the first 4 decimals are identical.

Adding to 15130321 its reverse (12303151), we get a palindrome (27433472).

It can be divided in two parts, 15130 and 321, that added together give a palindrome (15451).

The spelling of 15130321 in words is "fifteen million, one hundred thirty thousand, three hundred twenty-one".