13056421 has 4 divisors (see below), whose sum is σ = 14921632. Its totient is φ = 11191212.

The previous prime is 13056419. The next prime is 13056431. The reversal of 13056421 is 12465031.

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: 12465031 = 223 ⋅55897.

It is a cyclic number.

It is not a de Polignac number, because 13056421 - 2¹ = 13056419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13056392 and 13056401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13056431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932595 + ... + 932608.

It is an arithmetic number, because the mean of its divisors is an integer number (3730408).

Almost surely, 2^13056421 is an apocalyptic number.

It is an amenable number.

13056421 is a deficient number, since it is larger than the sum of its proper divisors (1865211).

13056421 is an equidigital number, since it uses as much as digits as its factorization.

13056421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865210.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 13056421 is about 3613.3669893882. The cubic root of 13056421 is about 235.4731436206.

The spelling of 13056421 in words is "thirteen million, fifty-six thousand, four hundred twenty-one".