13028421 has 8 divisors (see below), whose sum is σ = 19852864. Its totient is φ = 7444800.

The previous prime is 13028417. The next prime is 13028423. The reversal of 13028421 is 12482031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13028421 - 2² = 13028417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 620401 = 13028421 / (1 + 3 + 0 + 2 + 8 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13028423) 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 7 ways as a sum of consecutive naturals, for example, 310180 + ... + 310221.

It is an arithmetic number, because the mean of its divisors is an integer number (2481608).

Almost surely, 2^13028421 is an apocalyptic number.

It is an amenable number.

13028421 is a deficient number, since it is larger than the sum of its proper divisors (6824443).

13028421 is an equidigital number, since it uses as much as digits as its factorization.

13028421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620411.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13028421 is about 3609.4904072459. The cubic root of 13028421 is about 235.3046960599.

It can be divided in two parts, 130284 and 21, that added together give a triangular number (130305 = T₅₁₀).

The spelling of 13028421 in words is "thirteen million, twenty-eight thousand, four hundred twenty-one".