13030021 has 4 divisors (see below), whose sum is σ = 13048672. Its totient is φ = 13011372.

The previous prime is 13029979. The next prime is 13030037. The reversal of 13030021 is 12003031.

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: 12003031 = 61 ⋅196771.

It is a cyclic number.

It is not a de Polignac number, because 13030021 - 2⁷ = 13029893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13030051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8235 + ... + 9688.

It is an arithmetic number, because the mean of its divisors is an integer number (3262168).

Almost surely, 2^13030021 is an apocalyptic number.

It is an amenable number.

13030021 is a deficient number, since it is larger than the sum of its proper divisors (18651).

13030021 is an equidigital number, since it uses as much as digits as its factorization.

13030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18650.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 13030021 is about 3609.7120383765. The cubic root of 13030021 is about 235.3143281329.

Adding to 13030021 its reverse (12003031), we get a palindrome (25033052).

It can be divided in two parts, 130300 and 21, that added together give a 4-th power (130321 = 19⁴).

The spelling of 13030021 in words is "thirteen million, thirty thousand, twenty-one".