13042021 has 4 divisors (see below), whose sum is σ = 13128544. Its totient is φ = 12955500.

The previous prime is 13042013. The next prime is 13042033. The reversal of 13042021 is 12024031.

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: 12024031 = 269 ⋅44699.

It is a cyclic number.

It is not a de Polignac number, because 13042021 - 2³ = 13042013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13041992 and 13042010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13042091) 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, 43035 + ... + 43336.

It is an arithmetic number, because the mean of its divisors is an integer number (3282136).

Almost surely, 2^13042021 is an apocalyptic number.

It is an amenable number.

13042021 is a deficient number, since it is larger than the sum of its proper divisors (86523).

13042021 is an equidigital number, since it uses as much as digits as its factorization.

13042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86522.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 13042021 is about 3611.3738383059. The cubic root of 13042021 is about 235.3865435583.

Adding to 13042021 its reverse (12024031), we get a palindrome (25066052).

The spelling of 13042021 in words is "thirteen million, forty-two thousand, twenty-one".