13020421 has 4 divisors (see below), whose sum is σ = 13123072. Its totient is φ = 12917772.

The previous prime is 13020383. The next prime is 13020431. The reversal of 13020421 is 12402031.

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.

It is a cyclic number.

It is not a de Polignac number, because 13020421 - 2¹¹ = 13018373 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 (13020431) 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, 51135 + ... + 51388.

It is an arithmetic number, because the mean of its divisors is an integer number (3280768).

Almost surely, 2^13020421 is an apocalyptic number.

It is an amenable number.

13020421 is a deficient number, since it is larger than the sum of its proper divisors (102651).

13020421 is a wasteful number, since it uses less digits than its factorization.

13020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102650.

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

The square root of 13020421 is about 3608.3820474002. The cubic root of 13020421 is about 235.2565238627.

Adding to 13020421 its reverse (12402031), we get a palindrome (25422452).

The spelling of 13020421 in words is "thirteen million, twenty thousand, four hundred twenty-one".